CN218893496U - Reverse osmosis chemical cleaning permeate collection device - Google Patents
Reverse osmosis chemical cleaning permeate collection device Download PDFInfo
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- CN218893496U CN218893496U CN202223092902.1U CN202223092902U CN218893496U CN 218893496 U CN218893496 U CN 218893496U CN 202223092902 U CN202223092902 U CN 202223092902U CN 218893496 U CN218893496 U CN 218893496U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02A20/124—Water desalination
- Y02A20/131—Reverse-osmosis
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Abstract
The utility model relates to the technical field of water treatment, in particular to a reverse osmosis chemical cleaning permeate collection device which comprises a reverse osmosis unit, a chemical cleaning water tank, a cleaning water pump, a cleaning pipeline, a water inlet pipeline, a concentrated water pipeline, a high-pressure pump, a backflow pipeline, a water production pipeline, a permeate recovery pipeline and an observer.
Description
Technical Field
The utility model relates to the technical field of water treatment, in particular to a reverse osmosis chemical cleaning permeate collection device.
Background
Reverse osmosis is a water treatment technology adopting membrane separation, and is rapidly developed along with the progress of membrane scientific research and manufacturing process. The reverse osmosis water treatment technology in China starts from the 70 th century and is limited to electronic and semiconductor pure water at the earliest. The large-scale application starts in the power industry and then gradually expands to other industries. In recent years, along with the continuous development of membrane treatment technology, the increasingly strict national environmental protection standard and the increasing of water resource control force, reverse osmosis is widely applied to various industries such as sea water desalination, wastewater recovery, drinking water treatment and the like.
Various forms of materials such as hydrated metal oxides, calcium-containing precipitates, organics, and organisms that can cause contamination of the reverse osmosis membrane surface are present in the feed water to the water treatment system. During normal operation, the membrane within the reverse osmosis element is contaminated with inorganic salt scale, microorganisms, colloidal particles and insoluble organic matter. These contaminants deposit on the membrane surface during operation, resulting in a decrease or simultaneous deterioration of standardized product water flow and system desalination rates, respectively. Therefore, the membrane system must be effectively cleaned after running for a certain period, and the performance of the membrane system is recovered to the maximum extent.
The reverse osmosis chemical cleaning generally adopts a specific medicament, firstly, the medicament is added into a chemical cleaning water tank, dissolved and mixed through heating circulation and the like, the solution is conveyed into a reverse osmosis unit by a pump after reaching a specified pH value and temperature, the reverse osmosis unit is filled with the liquid medicament, and the solution reacts and dissolves with pollutants on the surface of a membrane in the reverse osmosis unit, such as inorganic salt scale, microorganisms, colloid particles and insoluble organic pollutants, and the pollutants on the surface of the membrane are gradually decomposed and washed clean through repeated soaking and circulation. The chemical cleaning device comprises a chemical cleaning water tank, a cleaning water pump, a cleaning pipeline and a reflux pipeline.
When the reverse osmosis unit normally operates, raw water is provided through the high-pressure pump, salt is trapped by the membrane element through the reverse osmosis unit, the water containing the salt becomes concentrated water to be discharged outside through the middle flow channel, the water from which the salt is removed becomes desalted water through the membrane, and the produced water is used for production and living.
The pressure provided by the general high-pressure pump is 1.0-1.5MPa, the membrane inlet pressure is maintained at about 1.0MPa, and the pressure loss in the reverse osmosis unit is 0.1-0.3MPa, so that the concentrated water pressure is 0.7-0.9MPa, and the produced water pressure is very small and only about 0.07 MPa. With the aggravation of the reverse osmosis unit pollution blockage, the pressure difference between the inlet water and the concentrated water is increased, the yield is reduced, and therefore, chemical cleaning is needed in time.
The pressure of the chemical cleaning pump is generally 0.3-0.4MPa, and the pollution substances on the membrane element are dissolved, neutralized and decomposed through low-pressure circulation and soaking. The chemical cleaning water inlet pipeline is communicated with the water outlet pipeline of the high-pressure pump, the chemical cleaning water outlet pipeline is switched through a valve, the chemical cleaning reflux pipeline is communicated with the concentrated water, and the chemical cleaning reflux pipeline is switched through a valve.
In the chemical cleaning process, the acid washing time and the alkali washing time are set, but the chemical cleaning effect cannot be judged, and only after the chemical cleaning is finished, the reverse osmosis unit is put into operation, the chemical cleaning effect can be judged by observing the pressure difference and the flow, so that the chemical cleaning is blind.
When the chemical cleaning liquid circulates under low pressure, only the cleaning water inlet pipeline and the return pipeline are used, the cleaning liquid medicine flows in the water inlet separation net flow channel between the membrane and the membrane, namely flows on the water inlet side of the membrane, and the liquid medicine can not reach the water producing side due to the fact that the collecting pipe is not arranged on the water producing side of the membrane, so that pollutants on the water producing side can not be timely and comprehensively removed, and the chemical cleaning effect is poor.
The reverse osmosis chemical cleaning permeate collection device can enable chemical cleaning liquid medicine to circularly flow on the water inlet side of the membrane, and enable the liquid medicine to reach the water producing side of the membrane, so that pollutants on the water producing side are timely and thoroughly dissolved, neutralized and reacted; the flow of the penetrating fluid in the chemical cleaning process of the reverse osmosis unit can be observed, the chemical cleaning effect can be intuitively judged, the chemical cleaning efficiency is improved, the chemical cleaning time is shortened, the chemical cleaning frequency is reduced, the service life of the membrane element is prolonged, the cost is saved for production and operation, and the labor intensity is reduced.
Disclosure of Invention
The utility model aims to solve the problems and provide a reverse osmosis chemical cleaning permeate collection device.
The purpose of the utility model is realized in the following way: reverse osmosis chemistry washs permeate collection device, including reverse osmosis unit, chemistry washs the water tank, wash the water pump, wash the pipeline, the inlet channel, concentrate pipeline and high-pressure pump, still include the return line, produce the water pipeline, permeate recovery pipeline and observer, the inlet end of inlet channel is connected with the high-pressure pump, the outlet end of inlet channel is connected to reverse osmosis unit, reverse osmosis unit is connected with produces the water pipeline, reverse osmosis unit is connected with permeate recovery pipeline, be provided with the motorised valve on the permeate recovery pipeline, permeate recovery pipeline is provided with the observer on being close to chemistry washs water tank department, permeate recovery pipeline is connected to chemistry washs the water tank, reverse osmosis unit is connected with concentrate pipeline, concentrate pipeline exit end is connected to the return line, the return line exit end is connected to chemistry washs the water tank, chemistry washs the water tank and is connected with the wash pipeline, be provided with the wash water pump on the wash pipeline, wash pipeline exit end is connected to the inlet channel.
The observer is a section of organic glass tube, which is resistant to acid and alkali corrosion and high temperature of 100 ℃.
The pipe diameter of the permeate recovery pipe is controlled to be 2.5-4 times that of the cleaning pipe, and PVC or stainless steel 316L is adopted.
The beneficial effects of the utility model are as follows: the device thoroughly cleans pollutants on the reverse osmosis water production side, accurately judges the chemical cleaning condition, timely adjusts the chemical cleaning scheme and improves the chemical cleaning effect.
Drawings
The utility model is further described below with reference to the accompanying drawings.
Fig. 1 is a schematic structural view of the present utility model.
Wherein: 1. high-pressure pump, 2 reverse osmosis unit, 3 produce water pipeline, 4 concentrate water pipeline, 5 motorised valve, 6 permeate recovery pipeline, 7 return line, 8 observer, 9 chemical cleaning water tank, 10 cleaning water pump, 11 cleaning pipeline.
Detailed Description
The pressure of the reverse osmosis chemical cleaning pump is generally 0.3-0.4MPa, and the pollutants on the membrane element are dissolved, neutralized and decomposed through low-pressure circulation and soaking. The chemical cleaning water inlet pipeline is communicated with the water outlet pipeline of the high-pressure pump, the chemical cleaning water outlet pipeline is switched through a valve, the chemical cleaning reflux pipeline is communicated with the concentrated water, and the chemical cleaning reflux pipeline is switched through a valve.
In the chemical cleaning process, the acid washing time and the alkali washing time are set, but the chemical cleaning effect cannot be judged, and only after the chemical cleaning is finished, the reverse osmosis unit is put into operation, the chemical cleaning effect can be judged by observing the pressure difference and the flow, so that the chemical cleaning is blind.
When the chemical cleaning liquid circulates under low pressure, only the cleaning water inlet pipeline and the return pipeline are used, the cleaning liquid medicine flows in the water inlet separation net flow channel between the membrane and the membrane, namely flows on the water inlet side of the membrane, and the liquid medicine can not reach the water producing side due to the fact that the collecting pipe is not arranged on the water producing side of the membrane, so that pollutants on the water producing side can not be timely and comprehensively removed, and the chemical cleaning effect is poor.
Therefore, the reverse osmosis chemical cleaning permeate liquid collecting device ensures that chemical cleaning liquid medicine not only circularly flows in the water inlet separation net flow passage, but also can permeate into the water producing side flow passage under low pressure of the chemical cleaning pump, so as to dissolve and neutralize pollutant on the water producing side, greatly improve the chemical cleaning effect, increase the judging means in the chemical cleaning process, save the chemical cleaning time and energy consumption and medicament consumption, and reduce the labor intensity of workers.
The specific technical concept is as follows: 1. the chemical cleaning permeate liquid is collected by arranging an independent pipeline on the water production side of the reverse osmosis unit, and because the permeate liquid amount is small, the problems of flow rate, economic cost, site, construction and the like are considered by arranging a permeate liquid recovery pipeline, the pipe diameter is generally smaller than that of the cleaning pipeline, and the pipe diameter of the cleaning pipeline is controlled to be 2.5-4 times that of the recovery pipeline. DN200 is adopted in a general chemical cleaning pipeline and a production pipeline with the yield of 200-350m3/h of the reverse osmosis unit, and DN80 is adopted in a chemical cleaning permeate recovery pipeline.
2. Because the reverse osmosis unit adopts strong acid and strong alkali for chemical cleaning, PVC or stainless steel 316L is adopted for the chemical cleaning, and the economical efficiency is considered, and the PVC is generally adopted. To achieve DN200 to DN80 conversion, special PVC tubing is installed. The reverse osmosis unit includes: reverse osmosis membrane element (industrial model has BW30-365FR, BW30-400 FR), membrane shell, connecting piece, instrument and meter, frame, valve etc.. The reverse osmosis unit is simply referred to as a membrane unit.
3. For the convenience of membrane element replacement operation, the contact opportunity of chemical agents and personnel is reduced, a chemical cleaning permeate liquid recovery pipeline is arranged on the upper part of a reverse osmosis unit, an electric valve is arranged, automatic switching can be realized during chemical cleaning, automatic switching of the valves in the process of multi-unit automatic switching and chemical cleaning is realized, and the labor intensity of personnel is reduced.
4. Setting an observer: an observer made of transparent materials is additionally arranged before the total collecting pipe enters the chemical cleaning water tank, and the flow of the penetrating fluid is observed in the chemical cleaning process. As the chemical wash time increases, the permeate gradually increases until the water fills the tube to confirm the end of the chemical wash. If the amount of the permeate liquid is small, the membrane element is seriously blocked, and the pollutants in the pore diameter of the membrane cannot be removed, so that the circulation is further enhanced, or the chemical cleaning liquid medicine is replaced, and the chemical cleaning formula is adjusted; the flow rate and the flow rate of the penetrating fluid are observed in the flushing process, and the chemical cleaning effect can be judged.
A reverse osmosis chemical cleaning permeate collection device is composed of 3 parts.
1. Reverse osmosis chemical cleaning permeate collection tube: from the reverse osmosis water producing side to the chemical wash tank. The pipe diameter of the pipeline is smaller than that of the cleaning pipeline, and the pipe diameter of the cleaning pipeline is controlled to be 2.5-4 times that of the recovery pipeline. DN80 is typically used in the permeate recovery line for chemical cleaning. PVC or stainless steel 316L material is adopted, and a reverse osmosis water production pipe is matched, for example, the reverse osmosis water production pipe is made of PVC material, and DN200 to DN80 conversion is realized by adopting special PVC pipe fittings. Namely, a PVC plug is added on a DN200 water-producing PVC pipe of each group of reverse osmosis units, a DN80PVC nipple is perforated on the plug, 100mm is welded, and a PVC flange is welded on the PVC nipple, so that the diameter change from DN200 to DN80 is realized.
If a plurality of groups of reverse osmosis are adopted, each group of reverse osmosis chemical cleaning recovery pipelines are connected, so that parallel operation is realized.
2. The chemical cleaning permeate recovery pipeline is arranged on the upper part of the reverse osmosis unit, is provided with a DN80 electric valve, can be automatically opened and closed during chemical cleaning, realizes automatic switching of multiple units and automatic valve opening and closing in the chemical cleaning process, and reduces labor intensity of personnel. Each group of collecting pipes is communicated and returns to the chemical cleaning water tank.
3. Setting an observer: an observer made of transparent materials is additionally arranged before the total collecting pipe enters the chemical cleaning water tank, and the flow of the penetrating fluid is observed in the chemical cleaning process. As the chemical wash time increases, the permeate gradually increases until the water fills the tube to confirm the end of the chemical wash. If the amount of the permeate liquid is small, the membrane element is seriously blocked, and the pollutants in the pore diameter of the membrane cannot be removed, so that the circulation is further enhanced, or the chemical cleaning liquid medicine is replaced, and the chemical cleaning formula is adjusted; the flow rate and the flow rate of the penetrating fluid are observed in the flushing process, and the chemical cleaning effect can be judged.
The reverse osmosis chemical cleaning permeate collection device comprises the following steps: step one: adding the medicament into a chemical cleaning water tank, dissolving and mixing through heating circulation, conveying the solution into a reverse osmosis unit by a cleaning water pump after reaching a specified pH value and temperature, filling the reverse osmosis unit with the liquid medicine, reacting and dissolving the solution with pollutant on the surface of the membrane in the reverse osmosis unit, and gradually decomposing and washing the pollutant on the surface of the membrane through soaking and circulation; step two: when the reverse osmosis unit normally operates, raw water is provided by the high-pressure pump, salt is trapped by the membrane element in the reverse osmosis unit, the water containing the salt is discharged outside through the middle flow channel to form concentrated water, the water from which the salt is removed is permeated through the membrane to form desalted water, and the produced water is used for production and living; step three: an independent permeate recovery pipeline is arranged on the water production side of the reverse osmosis unit to collect chemical cleaning permeate, and the pipe diameter of the cleaning pipeline is 2.5-4 times that of the permeate recovery pipeline; the permeate recovery pipeline is arranged at the upper part of the reverse osmosis unit, and is provided with an electric valve which can be automatically opened and closed during chemical cleaning; step four: an observer made of transparent materials is additionally arranged before a permeate recycling pipeline enters a chemical cleaning water tank, and the flow of the permeate is observed in the chemical cleaning process; as the chemical cleaning time is prolonged, the permeate gradually increases until the water flows into the pipe to determine that the chemical cleaning is finished; if the amount of the permeate liquid is small, the reverse osmosis membrane element is seriously blocked, and the pollutants in the pore diameter of the membrane cannot be removed, so that the circulation is further enhanced, or the chemical cleaning liquid is replaced, and the chemical cleaning formula is adjusted; the flow rate and the flow rate of the penetrating fluid are observed in the flushing process, and the chemical cleaning effect can be judged.
The high pressure pump provides pressure of 1.0-1.5MPa, the membrane inlet pressure is maintained at 0.8-1.0MPa, and the pressure loss in the reverse osmosis unit is 0.1-0.3MPa, so that the concentrated water pressure is 0.7-0.9MPa, and the produced water pressure is very small and only 0.06-0.08MPa.
The pressure of the chemical cleaning pump is 0.3-0.4MPa, and the chemical cleaning pump is circulated and soaked at low pressure so as to dissolve, neutralize and decompose pollutants on the reverse osmosis membrane element.
The first traditional Chinese medicine preparation comprises an acid washing agent and an alkali washing agent, wherein the acid washing agent comprises hydrochloric acid and citric acid; the alkaline washing agent comprises sodium tripolyphosphate, sodium dodecyl benzene sulfonate, liquid alkali or tablet alkali.
The specified PH value in the first step is that the PH value of acid washing is controlled to be 1-2.5, the PH value of alkali washing is controlled to be 11-12, and the temperature is required to be 36-38 ℃.
The first membrane and the third membrane of the Tai steel energy power main plant take industrial wastewater as a water source, the second membrane takes domestic wastewater as a water source, ultrafiltration and reverse osmosis are adopted to prepare desalted water, the two types of wastewater are complex in water quality, high in content of conductivity, microorganisms and the like, frequent in sewage blocking in operation and low in desalted water yield. Three systems have chemical cleaning systems before, but the chemical cleaning effect is poor, the time is long, the consumption of medicine is large, and the water quantity of the systems is restricted. After the chemical cleaning and recycling device is adopted, reverse osmosis membrane elements can be thoroughly cleaned, the use period of reverse osmosis is greatly prolonged, the chemical cleaning frequency is reduced, the medicament is saved, and the labor capacity of personnel is reduced.
The three-membrane system is provided with 8 sets of first-grade reverse osmosis membrane units, each set of 357 BW30-400FR reverse osmosis membrane elements, and the production scale is 200-230m 3 And (h) preparing desalted water by using the industrial waste water of the Tai steel as a water source for producing the Tai steel. A set of chemical cleaning system is matched, which comprises 2 IH200-150-400 (B) chemical cleaning water pumps with the flow of 300m 3 And/h, the lift is 40 meters; a volume of 10m 3 The glass fiber reinforced plastic chemical cleaning tank and steam heating. The chemical is added into a chemical cleaning tank, reverse osmosis product water is injected, and the chemical is circularly dissolved and heated to 38 ℃. Preparation for chemical cleaning is closedThe normal water inlet and outlet valves on the washed reverse osmosis membrane unit are opened, the chemical cleaning water inlet and outlet valves are opened, the reflux door on the chemical cleaning tank is opened, the chemical cleaning water pump is opened to inject the liquid medicine into the reverse osmosis membrane unit, the liquid medicine flows through the unit and returns to the chemical cleaning tank, the circulation is carried out for 2 hours, the pump is stopped, the soaking is carried out for 2 hours, the recirculation is carried out, the repeated operation is carried out for 4-5 times, the medicine discharge and the flushing are carried out, and the reverse osmosis unit is put into operation. The output is unstable after operation, 170-230m 3 And/h, and the running period is unstable and is 10-25 days. The chemical cleaning method has the advantages of high yield, long operation period, low yield and short operation period when the chemical cleaning effect is good. The fluctuation of the running water quantity of the system is large, the production and the use are influenced, and meanwhile, medicaments, energy consumption, manpower and the like are consumed.
Aiming at the situation, a UPVC permeate collection pipe of DN80 is added at the water production end of each group of reverse osmosis units, 8 groups of reverse osmosis collection pipes are converged and then returned to the chemical cleaning tank, and a transparent observer is added. At the chemical cleaning initial stage, a small amount of penetrating fluid can be interrupted in the collecting pipe, when the pollution and blockage is serious, no penetrating fluid exists, along with the extension of the chemical cleaning time, the penetrating fluid in the collecting pipe is gradually increased, and when the penetrating fluid is full of the pipe, the chemical cleaning effect can be judged to be better, and the chemical cleaning can be stopped. After the three membranes are added with the permeate collecting pipe, the chemical cleaning effect is judged by observing the liquid quantity in the permeate collecting pipe, and after the chemical cleaning is finished and the permeate collecting pipe is put into operation after being washed, the unit yield is 200m 3 The operation period reaches 28-35 days, the system yield is stable, the chemical cleaning time can be orderly arranged, the condition that several sets of reverse osmosis units wait for chemical cleaning can not occur, and the chemical cleaning cost is saved by 6.4 ten thousand yuan each year.
The utility model relates to a reverse osmosis water treatment technology, in particular to a reverse osmosis chemical cleaning permeate collection device, which is provided with independent reverse osmosis chemical permeate collection pipelines, so that chemical cleaning liquid is circulated and soaked on the water inlet side and the water producing side of a membrane, reverse osmosis membrane elements can be thoroughly cleaned, the service cycle of reverse osmosis is greatly prolonged, the chemical cleaning frequency is reduced, the medicament is saved, and the labor amount of personnel is reduced. The special observer is arranged, so that the flow and the flow velocity of the penetrating fluid in the chemical cleaning process can be intuitively mastered, the chemical cleaning formula can be timely adjusted, the chemical cleaning effect can be judged, and the medicament and the labor can be saved. The electric valve is arranged, so that the automatic switching of multiple units and the automatic switching of the valve in the chemical cleaning process are realized, the labor intensity of personnel is reduced, the contact frequency of the personnel and chemicals is reduced, and the safety coefficient is improved.
The above embodiments are merely examples of the present utility model, but the present utility model is not limited to the above embodiments, and any changes or modifications within the scope of the present utility model are intended to be included in the scope of the present utility model.
Claims (3)
1. Reverse osmosis chemistry washs permeate collection device, including reverse osmosis unit, chemistry washs water tank, washs water pump, washs pipeline, inlet channel, dense water pipeline and high-pressure pump, its characterized in that: still include return line, produce the water piping, permeate recovery pipeline and observer, the inlet end of inlet channel is connected with the high-pressure pump, the outlet end of inlet channel is connected to reverse osmosis unit, reverse osmosis unit is connected with produces the water piping, reverse osmosis unit is connected with permeate recovery pipeline, be provided with the motorised valve on the permeate recovery pipeline, permeate recovery pipeline is provided with the observer on being close to chemical cleaning water tank department, permeate recovery pipeline is connected to chemical cleaning water tank, reverse osmosis unit is connected with the concentrate pipeline, concentrate pipeline exit end is connected to return line, return line exit end is connected to chemical cleaning water tank, chemical cleaning water tank is connected with the wash pipeline, be provided with the wash water pump on the wash pipeline, wash pipeline exit end is connected to the inlet channel.
2. The reverse osmosis chemical cleaning permeate collection device of claim 1, wherein: the observer is a section of organic glass tube, which is resistant to acid and alkali corrosion and high temperature of 100 ℃.
3. The reverse osmosis chemical cleaning permeate collection device of claim 1, wherein: the pipe diameter of the permeate recovery pipe is controlled to be 2.5-4 times that of the cleaning pipe, and PVC or stainless steel 316L is adopted.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202223092902.1U CN218893496U (en) | 2022-11-17 | 2022-11-17 | Reverse osmosis chemical cleaning permeate collection device |
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| CN202223092902.1U CN218893496U (en) | 2022-11-17 | 2022-11-17 | Reverse osmosis chemical cleaning permeate collection device |
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