CN210214877U - Reverse osmosis concentration device - Google Patents
Reverse osmosis concentration device Download PDFInfo
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- CN210214877U CN210214877U CN201920314220.XU CN201920314220U CN210214877U CN 210214877 U CN210214877 U CN 210214877U CN 201920314220 U CN201920314220 U CN 201920314220U CN 210214877 U CN210214877 U CN 210214877U
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Abstract
The utility model discloses a reverse osmosis concentration device, which comprises a wastewater storage tank, a wastewater lifting pump, a security filter, a reverse osmosis high-pressure pump, a reverse osmosis concentrator and a concentrated brine tank, wherein the wastewater lifting pump is respectively connected with the wastewater storage tank and the security filter through pipelines, and the security filter is connected with the reverse osmosis concentrator through the reverse osmosis high-pressure pump; the reverse osmosis concentrator is provided with a desalted produced water outlet and a concentrated strong brine outlet, wherein the concentrated strong brine outlet is respectively connected with a strong brine tank and a wastewater storage tank through a strong brine removal tank pipeline and a strong brine return pipeline; still include the three-way valve, the entry of three-way valve with concentrated back strong brine export intercommunication, the three-way valve be equipped with two exports respectively with go strong brine tank strong brine pipeline with backward flow strong brine pipeline intercommunication. The multiple of high-salinity concentrated water concentration can be improved, so that the efficiency and the energy-saving performance of the four-effect evaporation equipment are improved.
Description
Technical Field
The utility model relates to a waste water zero release technique, concretely relates to reverse osmosis concentration device.
Background
The zero discharge technology and application of wastewater are already practically applied in a plurality of power plants, chemical industries and petrochemical industries and are increasingly popularized and popularized as a mature technology for environmental management.
The key of the wastewater zero-discharge technology is the application of a reverse osmosis principle, the wastewater is concentrated to a certain concentration by the desalination treatment of reverse osmosis, the produced low-salinity product water is continuously used in industry, the produced high-salinity concentrated water is subjected to the four-effect evaporation crystallization treatment, and finally the treated crystallized salt is continuously used in the industrial advanced treatment.
The higher the multiple of the concentration of the high-salinity concentrated water is, the higher the utilization rate of the wastewater is, and meanwhile, the treatment capacity of the subsequent four-effect evaporation equipment is greatly reduced, so that the investment cost is saved, and the energy consumption is reduced.
SUMMERY OF THE UTILITY MODEL
In view of above situation, in order to solve the problem that above-mentioned technique exists, the utility model provides a reverse osmosis concentration device can improve the concentrated multiple of high salt content dense water to promote four-effect evaporation equipment's efficiency and energy-conserving performance.
The utility model discloses a reverse osmosis concentration device, which comprises a wastewater storage tank, a wastewater lifting pump, a security filter, a reverse osmosis high-pressure pump, a reverse osmosis concentrator and a concentrated brine tank, wherein the wastewater lifting pump is respectively connected with the wastewater storage tank and the security filter through pipelines, and the security filter is connected with the reverse osmosis concentrator through the reverse osmosis high-pressure pump; the reverse osmosis concentrator is provided with a desalted produced water outlet and a concentrated strong brine outlet, wherein the concentrated strong brine outlet is respectively connected with a strong brine tank and a wastewater storage tank through a strong brine removal tank pipeline and a strong brine return pipeline; still include the three-way valve, the entry of three-way valve with concentrated back strong brine export intercommunication, the three-way valve be equipped with two exports respectively with go strong brine tank strong brine pipeline with backward flow strong brine pipeline intercommunication.
Preferably, a first proportion regulating valve is arranged on a connecting pipeline of the three-way valve and the concentrated salt water pipeline of the concentrated water removal tank, and a second proportion regulating valve is arranged on a connecting pipeline of the three-way valve and the backflow concentrated salt water pipeline.
Preferably, the three-way valve is an electric three-way valve or a pneumatic three-way valve.
Preferably, the wastewater storage tank is communicated with a pretreated wastewater inlet pipeline, the desalted water outlet is communicated with a water outlet pipeline, and the concentrated salt water tank is communicated with the four-effect evaporator.
Preferably, a water production conductivity meter is arranged on the water production outlet pipeline, and a concentrated water pipeline conductivity meter is arranged on the pipeline at the concentrated brine outlet.
Preferably, the wastewater lifting pump, the cartridge filter and the reverse osmosis high-pressure pump are respectively arranged in two groups in parallel.
After the technology provided by the utility model, according to the utility model discloses reverse osmosis enrichment facility has following beneficial effect:
the multiple of high-salinity concentrated water concentration can be improved, so that the efficiency and the energy-saving performance of the four-effect evaporation equipment are improved. Through increasing electrical control valve, can reduce loaded down with trivial details regulation work repeatedly, system configuration can let this enrichment facility realize DCS or PLC automatic control completely with the operation. The method has great significance in zero discharge project, and can control the value index of the strong brine in a high-efficiency control value range in real time, thereby achieving high efficiency and energy saving for the four-effect evaporator and becoming practical controllable.
Drawings
Fig. 1 shows a connection structure diagram of the reverse osmosis concentration device of the present invention.
Detailed Description
The present invention will be described in further detail with reference to embodiments shown in the drawings. The described embodiments include various specific details to aid understanding, but they are to be construed as merely illustrative, and not restrictive of all embodiments of the invention. Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. Meanwhile, in order to make the description more clear and concise, a detailed description of functions and configurations well known in the art will be omitted.
As shown in fig. 1, a reverse osmosis concentration device comprises a wastewater storage tank 1, a wastewater lift pump 2, a cartridge filter 3, a reverse osmosis high-pressure pump 4, a reverse osmosis concentrator 5 and a strong brine tank 6, wherein the wastewater lift pump 2 is respectively connected with the wastewater storage tank 1 and the cartridge filter 3 through pipelines, and the cartridge filter 3 is connected with the reverse osmosis concentrator 5 through the reverse osmosis high-pressure pump 4; the reverse osmosis concentrator 5 is provided with a desalted produced water outlet 51 and a concentrated strong brine outlet 52, wherein the concentrated strong brine outlet 52 is respectively connected with a strong brine tank 6 and a wastewater storage tank 1 through a strong brine removal tank pipeline 521 and a strong brine return pipeline 522; still include three-way valve 7, three-way valve 7's entry with concentrated back strong brine export 52 intercommunication, three-way valve 7 be equipped with two exports respectively with go strong brine case strong brine pipeline 521 and backward flow strong brine pipeline 522 intercommunication.
According to the reverse osmosis concentration device of the above embodiment, the connection pipeline between the three-way valve 7 and the concentrated brine pipeline 521 of the concentrated brine removal tank is provided with the first proportional control valve 71, and the connection pipeline between the three-way valve 7 and the concentrated brine return pipeline 522 is provided with the second proportional control valve 72.
According to the reverse osmosis concentration apparatus of the above embodiment, the three-way valve 7 is an electric three-way valve or a pneumatic three-way valve.
According to the reverse osmosis concentration device of the above embodiment, the wastewater storage tank 1 is communicated with the pretreated wastewater inlet line 19, the desalted water outlet 51 is communicated with the water outlet line 59, and the concentrated brine tank 6 is communicated with the four-effect evaporator.
According to the reverse osmosis concentration device of the above embodiment, the produced water outlet pipeline 59 is provided with a produced water conductivity meter 81, and the concentrated brine outlet 52 is provided with a concentrated brine pipeline conductivity meter 82.
According to the reverse osmosis concentration device of the embodiment, the wastewater lifting pump 2, the cartridge filter 3 and the reverse osmosis high-pressure pump 4 are respectively arranged in parallel. On one hand, the device can match the production capacity, can adopt a waste water lifting pump 2 and a security filter 3 with smaller specifications, and can also form step filtration treatment by pipeline connection.
According to the utility model discloses reverse osmosis enrichment facility, the principle of reverse osmosis concentrator 5 is the same with the reverse osmosis principle of application on other water treatment, and reverse osmosis membrane is the artificial semipermeable membrane that has certain characteristic that a simulation biological semipermeable membrane made, is reverse osmosis technology's core component. The principle of reverse osmosis technology is that under the action of the high-pressure reverse osmosis pump 4, which generates the osmotic pressure higher than the solution osmotic pressure, other substances are separated from water according to the characteristic that the other substances cannot permeate through the semipermeable membrane. The reverse osmosis membrane has a very small membrane pore size, and thus can effectively remove dissolved salts, colloids, microorganisms, organic substances, and the like in water.
The relevant terms are defined below.
1. Salt rejection
The salt rejection of reverse osmosis membrane elements is determined during the manufacturing and forming process, the salt rejection of reverse osmosis membranes to different substances is mainly determined by the structure and molecular weight of the substances, the salt rejection to high valence ions and complex monovalent ions can exceed 99%, and the salt rejection to monovalent ions such as: the salt removal rate of sodium ions, potassium ions and chloride ions is slightly low, but may exceed 98%.
The salt rejection and salt permeability calculation method of the reverse osmosis membrane comprises the following steps:
the salt permeability of the membrane is equal to the concentration of the produced salt/the concentration of the fed salt of the membrane multiplied by 100 percent
The salt rejection of the membrane (1-produced water salt content/feed water salt content of the membrane) × 100%
Salt permeability of the membrane is 100% -salt rejection
2. Water yield
Water yield-refers to the water production capacity of the reverse osmosis system, i.e., the amount of water that permeates through the reverse osmosis membrane per unit time, and is given in units of t/h or m 3/h.
3. Recovery rate of reverse osmosis membrane
The recovery rate is that the water yield/water inflow of the membrane component is multiplied by 100 percent
The reverse osmosis concentration device according to the embodiment of the utility model has the following operation principle and method.
Clean wastewater after the previous pretreatment is conveyed to a wastewater storage tank 1, and then is pumped into a security filter 3 through a wastewater lifting pump 2, wherein the security filter 3 has the function that impurities in a pipeline or untreated impurities are intercepted by a filter element with the filter pore diameter less than or equal to 5 mu in the filter.
The pressure water passing through the cartridge filter 3 is pumped into a reverse osmosis concentrator 5 through a reverse osmosis high-pressure pump 4. Under the pressure of a high-pressure pump, a part of water enters a water producing side by overcoming osmotic pressure, meanwhile, a small amount of monovalent and divalent ions which are approximately equal to 2 percent can also permeate a membrane to be dissolved in the produced water, the produced water is called 'desalted produced water', and the quality of the produced water with little salt content is superior to that of treated surface water (tap water) and is continuously recycled. The salt content of the produced water quality is detected on line on a produced water outlet pipeline by a conductivity meter.
And a part of the water and the salt which is not permeated form concentrated strong brine, and the water quality salinity of the strong brine is detected on line by an electric conductivity meter on a strong brine pipeline.
Part of concentrated strong brine continuously flows back to the waste water storage tank 1 to participate in cyclic concentration, and the other part of concentrated strong brine enters a strong brine tank 6 and is pumped into a four-effect evaporator by a delivery pump to be evaporated and crystallized.
In this process, as described above, a part of the brine is returned and a part of the brine is directly discharged to the brine tank 6. To illustrate more clearly, a simple calculation is made by way of example:
1. suppose that: the salt content of the wastewater is 5000mg/L, the recovery rate design value of the reverse osmosis concentrator 5 is 60% (the inflow water flow is 100t/h, the produced water flow is 60t/h, and the total concentrated water flow is 40t/h), and the actual operation value of the salt rejection rate of the system is 98%.
Calculating the salt content of the concentrated water: 5000X 100X 0.98 ÷ 40 ÷ 12250 mg/L.
The actually required salt content of the four-effect evaporation device is more than or equal to 100000 mg/L.
Referring to fig. 1, the concentrated water valve of the concentrated brine tank 6 needs to be closed first, the concentrated brine is directly circulated in a backflow manner, the salt content of the wastewater in the wastewater storage tank 1 is increased, and the concentrated brine with the salt content of more than or equal to 100000mg/L can be prepared only after the circulation is stopped.
At this time, not only the wastewater in the wastewater storage tank 1 is in closed circulation, 40t/h of wastewater is returned to the wastewater storage tank 1, but also at least 60t/h of wastewater with the wastewater salt content of 5000mg/L is supplemented into the water tank, so that the wastewater salt content of the water tank is actually a mixed variable.
Calculating the salt content of the wastewater in the wastewater storage tank 1 which needs to be reached after continuous circulation: a × 100 × 0.98 ÷ 40 ═ 100000mg/L and A ═ 40816 mg/L.
Assuming that 40816mg/L is reached in the waste water storage tank 1 after the circulation, the concentrate valve to the concentrate tank 6 needs to be opened, and the important problem in this case is how to adjust the proportional distribution of the two streams.
If the strong brine in the strong brine tank 6 is more, the strong brine in the backflow circulation is less, the supplemented 5000mg/L wastewater amount is increased to maintain the water yield supply of 60t/h, the salt content concentration of the wastewater storage tank 1 is smaller and smaller, the salt content of the strong brine in the reverse osmosis concentrator 5 is correspondingly reduced, and the final result of preparing the strong brine with the salt content of more than or equal to 100000mg/L cannot be realized; if less strong brine is fed to the strong brine tank 6, the amount of strong brine circulating back is correspondingly greater, which finally results in the salt content of the strong brine and the salt content in the waste water storage tank 1 being increasingly greater than the standard value of 40816 mg/L. More importantly, the higher the salt content of the inlet water is, the higher the osmotic pressure of the reverse osmosis membrane of the reverse osmosis concentrator 5 is, and the value exceeding 40816mg/L is too large, so that the original designed values cannot meet the design requirements: the given pressure of the reverse osmosis high-pressure pump 4 is insufficient, so that the rated effluent is generated for 60t/h without osmotic pressure, the liquid level of the waste water storage tank 1 is higher and higher, and the water inflow needs to be reduced again.
Therefore, during the operation, the water inlet flow of the two water quantity proportional valves and the wastewater storage tank 1 is continuously adjusted by the concentrated water reverse osmosis device, so that the water quantity balance is ensured, and the salt content of the concentrated brine is more than or equal to 100000 mg/L. This procedure is too frequent and requires a high level of expertise on the operator.
If the proportion of adjusting is not in place in this process, lead to equipment operation trouble condition can be more, consequently on aforementioned basis, this patent has increased a three-way valve and has realized the automatic adjustment process.
The three-way valve is arranged in front of the two proportion regulating valves, and an electric or pneumatic three-way valve is additionally arranged in front of the two proportion regulating valves. The specific operation principle and the method are that the opening ratio of the three-way valve is adjusted through a concentrated water pipeline conductivity meter 82 on the concentrated water pipeline, the conductivity value of the conductivity meter is converted into a 4-20mA signal according to a set value, and the three-way valve receives the 4-20mA signal to automatically adjust the opening of the valve. The inflow rate of the wastewater storage tank 1 is correspondingly adjusted to be larger or smaller corresponding to the opening adjustment of the three-way valve, so that the liquid level of the water tank is ensured to be stabilized at a constant value (the inflow adjusting valve is not shown in the figure). The realization of the adjusting function is controlled by an independent PLC or can enter the DCS control of the whole water making system, thereby completely realizing the computer remote control without manual operation.
According to the utility model discloses reverse osmosis enrichment facility can improve the concentrated multiple of high salt content dense water to promote four effects evaporation equipment's efficiency and energy-conserving performance. Through increasing electrical control valve, can reduce loaded down with trivial details regulation work repeatedly, system configuration can let this enrichment facility realize DCS or PLC automatic control completely with the operation. The method has great significance in zero discharge project, and can control the value index of the strong brine in a high-efficiency control value range in real time, thereby achieving high efficiency and energy saving for the four-effect evaporator and becoming practical controllable.
The terms "upper", "lower" or "above", "below" or the like are used herein in a relative relationship with respect to a normal use in a placed state, i.e., a positional relationship as generally shown in the drawings of the present application. When the placement state changes, for example, when the placement state is turned over, the corresponding positional relationship should be changed accordingly to understand or implement the technical solution of the present application.
Claims (6)
1. The reverse osmosis concentration device is characterized by comprising a wastewater storage tank (1), a wastewater lifting pump (2), a cartridge filter (3), a reverse osmosis high-pressure pump (4), a reverse osmosis concentrator (5) and a strong brine tank (6), wherein the wastewater lifting pump (2) is respectively connected with the wastewater storage tank (1) and the cartridge filter (3) through pipelines, and the cartridge filter (3) is connected with the reverse osmosis concentrator (5) through the reverse osmosis high-pressure pump (4); the reverse osmosis concentrator (5) is provided with a desalted water production outlet (51) and a concentrated strong brine outlet (52), wherein the concentrated strong brine outlet (52) is respectively connected with a strong brine tank (6) and a wastewater storage tank (1) through a strong brine removal tank pipeline (521) and a strong brine return pipeline (522); still include three-way valve (7), the entry of three-way valve (7) with concentrated back strong brine export (52) intercommunication, three-way valve (7) be equipped with two exports respectively with go strong brine case strong brine pipeline (521) with backward flow strong brine pipeline (522) intercommunication.
2. A reverse osmosis concentration device according to claim 1, wherein a first proportional regulating valve (71) is arranged on a connecting pipeline of the three-way valve (7) and the concentrated brine pipeline (521) of the de-concentrating water tank, and a second proportional regulating valve (72) is arranged on a connecting pipeline of the three-way valve (7) and the concentrated brine pipeline (522) of the return concentrated brine.
3. A reverse osmosis concentration plant according to claim 1, wherein the three-way valve (7) is an electric three-way valve or a pneumatic three-way valve.
4. A reverse osmosis concentration device according to any one of claims 1 to 3, wherein the waste water storage tank (1) is in communication with a pre-treated waste water inlet line (19), the desalinated product water outlet (51) is in communication with a product water outlet line (59), and the strong brine tank (6) is in communication with a four-effect evaporator.
5. A reverse osmosis concentration device according to claim 4, wherein the water production outlet pipeline (59) is provided with a water production conductivity meter (81), and the pipeline at the concentrated brine outlet (52) is provided with a concentrated brine pipeline conductivity meter (82).
6. A reverse osmosis concentration device according to any one of claims 1 to 3, wherein the wastewater lift pump (2) and the cartridge filter (3) and the reverse osmosis high pressure pump (4) are respectively provided in two sets in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920314220.XU CN210214877U (en) | 2019-03-13 | 2019-03-13 | Reverse osmosis concentration device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920314220.XU CN210214877U (en) | 2019-03-13 | 2019-03-13 | Reverse osmosis concentration device |
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| CN210214877U true CN210214877U (en) | 2020-03-31 |
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