CN113735222B - Multistage membrane concentration combination device and technology comprising energy recovery - Google Patents
Multistage membrane concentration combination device and technology comprising energy recovery Download PDFInfo
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- 239000012141 concentrate Substances 0.000 claims description 19
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Abstract
The invention discloses a multi-section membrane concentration combination device and a multi-section membrane concentration combination process comprising energy recovery, wherein the combination device comprises N-level high-pressure membrane units which are arranged in parallel, each high-pressure membrane unit comprises a water inlet valve, a variable-frequency high-pressure pump, a high-pressure membrane combination and a proportional valve or an energy recovery pump, the high-pressure membrane elements are arranged in the high-pressure membrane combination, and each high-pressure membrane combination is provided with an independent water inlet, a water production outlet and a concentrated solution outlet. The invention realizes the high-multiplying power concentration of liquid under lower pressure by matching and combining the high-pressure membrane units in the device and controlling and adjusting the technological operation parameters.
Description
Technical Field
The invention relates to the technical field of membrane concentration of high-concentration fluid (including high-salt wastewater, material concentration and the like), in particular to a multi-section membrane concentration combined device and a multi-section membrane concentration combined process comprising energy recovery.
Background
At present, the treatment and recycling and the reduction emission of the high-salt wastewater are mainly carried out by adopting a membrane method of sea water desalination reverse osmosis and a thermal method technology of evaporation crystallization. The conventional thermal method technology generally adopts an evaporator and a crystallizer to heat, evaporate, concentrate and crystallize the wastewater by utilizing an external heat source (energy), so that water and salt in the wastewater are separated, and fresh water is recycled to the maximum extent. However, the high-salt wastewater generally has larger water treatment amount, a large amount of heat is consumed in the concentration process, and the thermal process has higher requirements on the manufacturing, operation and maintenance of the evaporation and crystallization equipment, and the disposable investment, operation and maintenance cost of the equipment is at a higher level. Compared with the thermal method technology, the membrane technology is generally realized through a conventional sea water desalination membrane system, high-salt wastewater is subjected to multistage concentration and decrement through a sea water desalination membrane under high pressure, and the generated purer product water is recycled.
Compared with the thermal method technology, the membrane method technology has obvious advantages in terms of equipment investment and operation maintenance under the condition of low concentration endpoint of 100-150g/L of total dissolved solids (Total Dissolved Solids, TDS for short) of wastewater. However, the design and operation of a common reverse osmosis system require that the operating pressure of the system is higher than the osmotic pressure of the final concentrated solution, and when the TDS of the high-salt wastewater is higher than 70g/L, the design of the ultra-high-pressure reverse osmosis system and the ultra-high-pressure membrane element are required, and the disposable investment and operation and maintenance costs of the high-pressure system and the high-pressure membrane element are also higher.
Disclosure of Invention
The invention aims to provide a multistage membrane concentration combination device and a multistage membrane concentration combination process comprising energy recovery, and the high-magnification concentration of liquid under lower pressure is realized by matching combination of each stage of high-pressure membrane units in the device and control and adjustment of process operation parameters.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
a multi-stage membrane concentration assembly including energy recovery, comprising:
the N-level high-pressure membrane units are arranged in parallel; the water inlet pipelines of the high-pressure membrane units are respectively connected to a total water inlet pipeline which is connected with a raw water tank; a total water inlet pump is arranged in the total water inlet pipeline;
the high-pressure membrane unit comprises a water inlet valve, a variable-frequency high-pressure pump, a high-pressure membrane combination and a proportional valve or an energy recovery pump; wherein,,
the high-pressure membrane assembly is provided with a water inlet, a water outlet, a concentrated solution outlet and a high-pressure membrane element therein; the water inlet is connected to a main water inlet pipeline through a water inlet pipeline, and a water inlet valve and a variable-frequency high-pressure pump are sequentially arranged in the water inlet pipeline; the concentrated solution outlet is connected with a concentrated solution outlet pipeline, and the concentrated solution outlet pipeline is connected to variable-frequency high-pressure pumps of the present-stage and the subsequent-stage high-pressure membrane units through a proportional valve or an energy recovery pump; the produced water outlet is connected to a water inlet pipeline of any one stage of high-pressure membrane unit in front of the present stage;
the water outlet of the high-pressure membrane combination of the first-stage high-pressure membrane unit is connected to a water producing tank;
and the variable-frequency high-pressure pump, the proportional valve or the energy recovery pump is electrically connected with the control module.
Preferably, a cartridge filter is further provided, and the cartridge filter is disposed in the main water inlet pipeline, or a plurality of cartridge filters are respectively disposed in the water inlet pipeline of each stage of high-pressure membrane unit.
Preferably, the high-pressure membrane element is a roll, a disc or a tube.
Preferably, a pressure sensor and a flowmeter are arranged in the water inlet pipeline of each high-pressure membrane unit, and the pressure sensor and the flowmeter are electrically connected with the control module.
Preferably, the water inlet valve is a ball valve.
The invention relates to a multistage high-pressure membrane concentration combined process comprising energy recovery, which comprises the following steps of:
1) The water inflow from the raw water tank is respectively conveyed to an N-level high-pressure membrane unit through a total water inflow pump, pressurized through a variable-frequency high-pressure pump, and then conveyed to a high-pressure membrane combined water inlet, and concentrated through a high-pressure membrane element; during the period, according to the salt interception rate of the high-pressure membrane element, the pressure change of the variable-frequency high-pressure pump is adjusted to control the water yield, so that the concentration of the water produced by each high-pressure membrane unit is lower than that of the water fed in the stage; the salt interception rate of the high-pressure membrane element is 20-99%;
2) After the water inflow is concentrated by each stage of high-pressure membrane element, the concentrated solution passes through a proportional valve or an energy recovery pump, one part of the concentrated solution is mixed with the water inflow part of the next stage by a variable-frequency high-pressure pump of the next stage high-pressure membrane unit, the other part of the concentrated solution is mixed with the water inflow part of the next stage by a variable-frequency high-pressure pump of the next stage high-pressure membrane unit, and the produced water enters a water inlet pipeline of any stage of high-pressure membrane unit before the next stage;
3) Concentrate discharged from the last-stage high-pressure membrane unit is collected and discharged after passing through a proportional valve or an energy recovery pump; the water inlet product water which is concentrated by the combination of the N-level high-pressure membrane units is discharged from a water outlet of the first-level high-pressure membrane unit and enters a water production tank.
Preferably, the pressure of each high-pressure membrane unit is adjusted according to the salt interception rate of the high-pressure membrane element, so as to control the flow of the water flowing into the high-pressure membrane element.
Preferably, the total dissolved solids content in the feed water is > 10g/L and each dissolved solids content is less than its saturation solubility.
Preferably, the pressure of the inlet water in the step 1) is 20-150bar after the inlet water is pressurized by a variable-frequency high-pressure pump.
Preferably, the total dissolved solids content in the concentrate is 50 to 250g/L.
The membrane concentration combined device provided by the invention has the advantages that the multistage high-pressure membrane units independently operate, each stage of high-pressure membrane unit is internally provided with the independent pressure and flow control unit, the operation parameters can be automatically adjusted according to the change of inflow water, the pressure of each stage of high-pressure membrane unit is accurately adjusted and controlled within a wider range of 20-150bar and the recovery rate of 10-90%, and the stability and the continuity of the system operation are ensured in actual operation.
The proportional valve or the energy recovery pump in the membrane concentration combined device is used for quantitatively controlling and distributing the proportion of concentrated solution generated in the stage to enter the stage and the subsequent stage respectively, so that the concentration of water inlet and concentrated solution in each stage of high-pressure membrane unit is regulated, devices such as a high-pressure membrane element, a variable-frequency high-pressure pump and the like in each stage of high-pressure membrane unit in the whole system can operate within the physical limit of the devices, and finally the stable operation of the whole device is achieved; the proportion of concentrated solution generated by the high-pressure membrane unit at the current stage to the high-pressure membrane unit at the next stage is regulated by regulating the distribution coefficient of the proportional valve; the energy recovery pump adjusts the proportion of concentrated solution generated by the high-pressure membrane unit at the current stage to enter the high-pressure membrane unit at the next stage and the high-pressure membrane unit at the next stage by adjusting the frequency, meanwhile, the energy recovery pump can also reduce the pressure of the concentrated solution to recover energy and convey the recovered energy to the variable-frequency high-pressure pump, so that the fluctuation of the temperature of the system at each stage is reduced, the operation cost of a high-pressure system is reduced, the independent operation and adjustment capability of each high-pressure membrane unit are ensured, and the operation stability of the system is improved.
In the process design of the invention, any one-stage high-pressure membrane unit can be selected to return to any one-stage high-pressure membrane unit before the stage according to the concentration of produced water, so that the flexibility of reprocessing the produced water of the stage is increased, the concentration of produced water of each stage of high-pressure membrane unit is not fixed according to the difference of salt interception rates of high-pressure membrane elements in each stage of high-pressure membrane unit, the concentration of produced water of the stage of high-pressure membrane unit returns to any one stage before the stage, and the concentration of produced water of the stage and the concentration of inlet water returned to the stage of the stage are ensured to be not greatly different, so that the mixed inlet water concentration can not be greatly changed, and the stable and normal operation of the whole system is ensured; when the concentration of the produced water of the stage is greatly different from the concentration of the inlet water returned to the stage, the produced water and the inlet water are required to be fully mixed to ensure the stable operation of the system, and the produced water and the inlet water are difficult to be fully mixed in the actual use process.
In the whole process, the variable-frequency high-pressure pump and the proportional valve or the energy recovery pump in each stage of high-pressure membrane unit can be independently controlled, so that the operation parameters of each stage of high-pressure membrane unit can be conveniently adjusted according to actual operation conditions, and the process can normally and stably operate; the pressure of each high-pressure membrane unit is regulated according to the salt interception rate of the high-pressure membrane element, so that the flow of the water flowing in the stage is controlled.
Compared with the Chinese patent CN201810312173.5, the invention mainly has the following differences:
1. in chinese patent CN201810312173.5, the produced water of the M (K) stage can only return to the M (K-1) stage, which may cause the osmotic pressure difference generated by the difference between the concentration of the water fed to the M (K-1) stage and the concentration of the concentrated solution to be far greater than the pressure that can be generated by the variable-frequency high-pressure pump, so that the produced water of the M (K-1) stage is not generated, or the concentration of the water fed to the M (K-1) stage is lower than the concentration of the produced water, at this time, the variable-frequency high-pressure pump cannot operate normally, and the stage cannot be quantitatively controlled;
according to the concentration of produced water, any stage before the stage can be selected to return to, so that the whole system can run more stably and efficiently, and the phenomenon that the whole system cannot run normally due to the fact that the mixed water inlet concentration is too high or too low after the produced water of the stage is mixed with the water inlet of any stage before the stage and exceeds a parameter interval in which a variable-frequency high-pressure pump or a high-pressure membrane element can work effectively is avoided. Different process routes can be designed according to different membrane element performances
2. The chinese patent CN201810312173.5 particularly strongly regulates that the produced water of the high-pressure membrane unit M (K) can only return to the M (K-1) level, and requires that the salt rejection rate of the high-pressure membrane elements in the high-pressure membrane units M (1) to M (K) be sequentially reduced, if the inlet water concentration and the final concentrate concentration are determined, the high-pressure membrane elements with N specific numerical salt rejection rates are found, so that the concentration of the final concentrate can meet the set requirement, but in actual cases, not all the high-pressure membrane elements with salt rejection rates actually exist on the market, that is, the process of the patent and the design of the high-pressure membrane elements cannot enable the final concentrate concentration to meet the set requirement;
the salt rejection rate of the high-pressure membrane element in each stage of high-pressure membrane unit is only controlled within the range of 20-99%, the high-pressure membrane element is not required to have specific salt rejection rate, the salt rejection rate of each stage of high-pressure membrane element is not required to be sequentially reduced or sequentially increased, and the concentration of the final concentrated solution can meet the set requirement by controlling the water produced by any stage of high-pressure membrane unit to return to the stage with which the concentration of any water before the stage is matched.
The invention has the beneficial effects that:
the membrane concentration combined device adopts the multistage independently operated high-pressure membrane units, and each stage of high-pressure membrane unit is internally provided with the independent pressure and flow control unit, so that the frequency of the high-pressure pump of the stage of high-pressure membrane unit is regulated, and the pressure and flow of the stage of inflow water are further controlled, thereby controlling the inflow water and the water yield and the concentration of the stage of inflow water, reducing the fluctuation of the temperature of each stage of system, and ensuring the stability and the continuity of the operation of the device.
In the process of the invention, any one-stage high-pressure membrane unit can produce water, and any one-stage high-pressure membrane unit before the stage can be selected to return to according to the concentration of produced water, so that the whole system can operate more stably and efficiently, and the process parameters in the operation process are controlled by combining the salt interception rate of the high-pressure membrane element in each stage of high-pressure membrane unit, and the final concentration liquid concentration meeting the requirements is obtained by controlling the process parameters.
Drawings
FIG. 1 is a schematic diagram of a multi-stage membrane concentration assembly including energy recovery according to the present invention.
Fig. 2 is a schematic structural diagram of embodiment 1 of the present invention.
Fig. 3 is a schematic structural diagram of embodiment 2 of the present invention.
Fig. 4 is a schematic structural diagram of embodiment 3 of the present invention.
Fig. 5 is a schematic structural diagram of embodiment 4 of the present invention.
Detailed Description
Referring to fig. 1, the multi-stage membrane concentration assembly including energy recovery according to the present invention comprises:
the N-level high-pressure membrane units are arranged in parallel; the water inlet pipelines of the high-pressure membrane units M (K, K is more than or equal to 1 and N is more than or equal to 1) are respectively connected to a total water inlet pipeline which is connected with a raw water tank; a total water inlet pump 1 is arranged in the total water inlet pipeline;
the high-pressure membrane unit comprises a water inlet valve 2, a variable-frequency high-pressure pump 3, a high-pressure membrane combination 4 and a proportional valve or an energy recovery pump 5; wherein,,
the high-pressure membrane combination 4 is provided with a water inlet, a water outlet, a concentrated solution outlet and a high-pressure membrane element therein; the water inlet is connected to a main water inlet pipeline through a water inlet pipeline, and a water inlet valve 2 and a variable-frequency high-pressure pump 3 are sequentially arranged in the water inlet pipeline; the concentrated solution outlet is connected with a concentrated solution outlet pipeline, and the concentrated solution outlet pipeline is connected to variable-frequency high-pressure pumps 3 of the present-stage and later-stage high-pressure membrane units through a proportional valve or an energy recovery pump 5; the produced water outlet is connected to a water inlet pipeline of any one stage of high-pressure membrane unit in front of the present stage;
the water outlet of the high-pressure membrane combination 4 of the first-stage high-pressure membrane unit is connected to a water producing tank;
the variable-frequency high-pressure pump 3, the proportional valve or the energy recovery pump 5 are electrically connected with the control module.
Preferably, a cartridge filter 6 is further provided, and the cartridge filter 6 is disposed in the main water inlet pipeline, or a plurality of cartridge filters 6 are disposed in the water inlet pipeline of each stage of high-pressure membrane unit.
Preferably, the high-pressure membrane element is a roll, a disc or a tube.
Preferably, a pressure sensor and a flowmeter are further arranged in the water inlet pipeline of each high-pressure membrane unit, and the pressure sensor and the flowmeter are electrically connected with the control module.
Preferably, the water inlet valve is a ball valve.
The invention relates to a multistage high-pressure membrane concentration combined process comprising energy recovery, which comprises the following steps of:
1) The water inflow from the raw water tank is respectively conveyed to an N-level high-pressure membrane unit through a total water inflow pump, pressurized through a variable-frequency high-pressure pump 1 and then conveyed to a water inlet of a high-pressure membrane combination 4, and concentrated through a high-pressure membrane element; during the process, according to the salt interception rate of the high-pressure membrane element, the pressure change of the variable-frequency high-pressure pump 3 is adjusted to control the water yield, so that the concentration of the water produced by each high-pressure membrane unit is lower than that of the water fed in the stage; the salt interception rate of the high-pressure membrane element is 20-99%;
2) After the water inflow is concentrated by each stage of high-pressure membrane element, the concentrated solution passes through a proportional valve or an energy recovery pump, one part of the concentrated solution is mixed with the water inflow part of the next stage by a variable-frequency high-pressure pump of the next stage high-pressure membrane unit, the other part of the concentrated solution is mixed with the water inflow part of the next stage by a variable-frequency high-pressure pump of the next stage high-pressure membrane unit, and the produced water enters a water inlet pipeline of any stage of high-pressure membrane unit before the next stage;
3) Concentrate discharged from the last-stage high-pressure membrane unit is collected and discharged after passing through a proportional valve or an energy recovery pump 5; the water inlet product water which is concentrated by the combination of the N-level high-pressure membrane units is discharged from a water outlet of the first-level high-pressure membrane unit and enters a water production tank.
Preferably, each high-pressure membrane unit controls the pressure, flow and energy recovery rate of the inlet water respectively by adjusting a variable-frequency high-pressure pump and a proportional valve or an energy recovery pump through a control module.
Preferably, the total dissolved solids content in the feed water is > 10g/L and each dissolved solids content is less than its saturation solubility.
Preferably, the pressure of the inlet water in the step 1) is 20-150bar after the inlet water is pressurized by a variable-frequency high-pressure pump.
Preferably, the total dissolved solids content in the concentrate is 50 to 250g/L.
Example 1
Referring to fig. 2, a two-stage high-pressure membrane concentration combined device including energy recovery is shown, which comprises a total water inlet pump FP1, two-stage high-pressure membrane units M (1) and M (2), water inlet valves T1 and T2, security filters F1 and F2, variable-frequency high-pressure pumps HP1 and HP2, high-pressure membrane combinations R1 and R2, which are respectively arranged correspondingly, wherein high-pressure membrane elements are respectively 99% and 67%, high-pressure energy recovery pumps HPR1 and HPR2, and independent control modules. The total inlet, total produced water discharge and total concentrate discharge of the system are indicated by F, P and C, respectively.
The water inflow is known to be 10m 3 After pretreatment by a pre-stage precipitation and ultrafiltration process, measuring TDS=22g/L of water inflow, controlling T1 to be completely opened and T2 to be completely closed, conveying the water inflow from an original water tank to a high-pressure membrane unit M (1) through a total water inflow pump FP1, pressurizing by a variable-frequency high-pressure pump HP1 and then entering a high-pressure membrane combination R1, concentrating the concentrated solution generated by the high-pressure membrane unit M (1) through an energy recovery pump HPR1, mixing one part of the concentrated solution with the water inflow part of the stage through a variable-frequency high-pressure pump HP2 of the high-pressure membrane unit M (2), mixing the other part of the concentrated solution with the water inflow part of the stage through a variable-frequency high-pressure pump HP1 of the high-pressure membrane unit M (2), mixing the water inflow part of the high-pressure membrane unit M (2) and returning the water inflow part of the high-pressure membrane unit M (1), concentrating the water inflow through two-stage high-pressure membrane units, and concentrating the water inflow part of 8M 3 The produced water of/h is collected and recycled through a total produced water discharge port P of a high-pressure membrane unit M (1), and the water is 2M 3 The concentrate of/h is collected via the total concentrate discharge C of the high-pressure membrane unit M (2) for further processing.
In the embodiment, the stable operation recovery rate of the system is about 80%, the TDS=110g/L measured finally by the concentrated solution, the TDS=0.2 g/L of produced water can be directly recycled, and the operation pressure of each high-pressure membrane is 30-80bar. The relevant system operating parameters are as in table 1:
TABLE 1
Example 2
Referring to fig. 3, a three-stage high-pressure membrane concentration combination device including energy recovery is shown, which comprises a total water inlet pump FP1, three-stage high-pressure membrane units M (1), M (2) and M (3), water inlet valves T1, T2 and T3 respectively and correspondingly arranged, a security filter B, variable-frequency high-pressure pumps HP1, HP2 and HP3, high-pressure membrane combinations R1, R2 and R3, wherein the high-pressure membrane elements are respectively 99%, 52% and 70%, high-pressure energy recovery pumps HPR1, HPR2 and HPR3 and independent control modules.
The water inflow is known to be 8m 3 After pretreatment by a pre-stage precipitation and ultrafiltration process, TDS=50g/L is measured, water inlet valves T1 and T2 are completely opened, water inlet valve T3 is completely closed, water inlet from an original water tank is respectively conveyed into high-pressure membrane units M (1) and M (2) through a total water inlet pump FP1 and through water inlet valves T1 and T2, the water inlet is pressurized by variable-frequency high-pressure pumps HP1 and HP2 and sequentially enters high-pressure membrane combinations R1, R2 and R3, concentrated solution generated by each stage of high-pressure membrane units is respectively subjected to energy recovery pumps, one part of concentrated solution is mixed with the next stage of water inlet part through a variable-frequency high-pressure pump of the next stage of high-pressure membrane unit, the other part of concentrated solution is mixed with the next stage of water inlet part through a variable-frequency high-pressure pump of the next stage of high-pressure membrane unit, water produced by the high-pressure membrane units M (2) and M (3) is returned to a water inlet pipeline of the high-pressure membrane unit M (1), and concentrated by three stages of high-pressure membrane units M (1), and 6.3M is obtained after concentration 3 The produced water of/h is collected and recycled through a total produced water discharge port P of a high-pressure membrane unit M (1), and the thickness of the produced water is 1.7M 3 The concentrate of/h is collected via the total concentrate discharge C of the high-pressure membrane unit M (3) for further processing.
In the embodiment, the stable operation recovery rate of the system is about 79%, the tds=250 g/L of the concentrated solution is finally measured, the produced water tds=0.5 g/L can be directly recycled, and the operation pressure of each stage of high-pressure membrane is 30-90bar. The relevant system operating parameters are as in table 2:
TABLE 2
Example 3
Referring to fig. 3, a three-stage high-pressure membrane concentration combination device including energy recovery is shown, which comprises a total water inlet pump FP1, three-stage high-pressure membrane units M (1), M (2) and M (3), water inlet valves T1, T2 and T3 respectively and correspondingly arranged, a security filter B, variable-frequency high-pressure pumps HP1, HP2 and HP3, high-pressure membrane combinations R1, R2 and R3, wherein the high-pressure membrane elements are respectively 99%, 56% and 26%, high-pressure energy recovery pumps HPR1, HPR2 and HPR3 and independent control modules.
The water inflow is known to be 1.6m 3 After pretreatment by a pre-stage precipitation and ultrafiltration process, TDS=30g/L is measured, water inlet valves T1 and T3 are completely opened, water inlet valve T2 is completely closed, water inlet from an original water tank is conveyed to each stage through a total water inlet pump FP1, water inlet is pressurized by a variable-frequency high-pressure pump and sequentially enters a high-pressure membrane combination, concentrated solution generated by each stage of high-pressure membrane units is respectively subjected to energy recovery pumps, one part of concentrated solution is mixed with the water inlet part of the concentrated solution through the variable-frequency high-pressure pump of a later stage of high-pressure membrane unit, the other part of concentrated solution is mixed with the water inlet part of the concentrated solution through the variable-frequency high-pressure pump of the first stage of high-pressure membrane unit, water produced by a high-pressure membrane unit M (3) is returned to the high-pressure membrane unit M (2) and mixed with the water inlet part of the high-pressure membrane unit M (1), water produced by the high-pressure membrane unit M (2) is returned to the high-pressure membrane unit M (1), and the water inlet part of the high-pressure membrane unit M (1) is mixed with the water inlet part of the high-pressure membrane unit (1), and concentrated by a third stage of high-pressure membrane unit is concentrated by the high-pressure membrane unit, and 1.4M 3 The produced water of/h is collected and recycled through a total produced water discharge port P of a high-pressure membrane unit M (1), and the thickness of the produced water is 0.2M 3 The concentrate of/h is collected via the total concentrate discharge C of the high-pressure membrane unit M (2) for further processing.
In the embodiment, the stable operation recovery rate of the system is about 87%, the TDS=182 g/L is finally measured in the concentrated solution, the TDS=0.2 g/L of the produced water can be directly recycled, and the operation pressure of each high-pressure membrane is 30-90bar. The relevant system operating parameters are as in table 3:
TABLE 3 Table 3
Example 4
Referring to fig. 4, a four-stage high-pressure membrane concentration combined device comprising energy recovery is shown, which comprises a total water inlet pump FP1, three-stage high-pressure membrane units M (1), M (2), M (3) and M (4), water inlet valves T1, T2, T3 and T4 respectively and correspondingly arranged, a cartridge filter B, variable-frequency high-pressure pumps HP1, HP2, HP3 and HP4, high-pressure membrane combinations R1, R2, R3 and R4, wherein the high-pressure membrane elements are respectively 99%, 50% and 55%, high-pressure energy recovery pumps HPR1, HPR2, HPR3 and HPR4, and independent control modules.
The water inflow is known to be 10m 3 After pretreatment by a pre-precipitation and ultrafiltration process, tds=10g/L of the feed water was measured. The water inlet enters the system through the main inlet F, wherein the water inlet valves T1 and T2 are completely opened, the water inlet valves T3 and T4 are completely closed, the water inlet sequentially enters the high-pressure membrane assemblies R1, R2, R3 and R4, concentrated solutions generated by the high-pressure membrane units at each level are respectively subjected to energy recovery pumps, one part of the concentrated solution is mixed with the water inlet part of the concentrated solution through the variable-frequency high-pressure pump of the next-level high-pressure membrane unit, the other part of the concentrated solution is mixed with the water inlet part of the concentrated solution through the variable-frequency high-pressure pump of the next-level high-pressure membrane unit, the produced water of the high-pressure membrane unit M (2) and the produced water of the high-pressure membrane unit M (3) enter the high-pressure membrane unit M (1) and are mixed with the water inlet of the high-pressure membrane unit M (1), and the produced water of the high-pressure membrane unit M (4) enters the high-pressure membrane unit M (2) and is 9.0M after being concentrated through four-level high-pressure membranes 3 The produced water of/h is collected and recycled through a total produced water discharge port P of a high-pressure membrane unit M (1), and the thickness of the produced water is 0.9M 3 The concentrate of/h is collected via the total concentrate discharge C of the high-pressure membrane unit M (4) for further processing.
In the embodiment, the stable operation recovery rate of the system is about 90%, the tds=194 g/L of the concentrated solution is finally measured, the produced water tds=0.1 g/L can be directly recycled, and the operation pressure of each stage of high-pressure membrane is 30-140bar. The relevant system operating parameters are as in table 2:
TABLE 4 Table 4
Claims (10)
1. A multi-stage membrane concentration assembly including energy recovery, comprising:
n-level high-pressure membrane units, wherein N is a natural number more than or equal to 3, and are arranged in parallel; the water inlet pipelines of the high-pressure membrane units are respectively connected to a total water inlet pipeline which is connected with a raw water tank; a total water inlet pump is arranged in the total water inlet pipeline;
the high-pressure membrane unit comprises a water inlet valve, a variable-frequency high-pressure pump, a high-pressure membrane combination and a proportional valve or an energy recovery pump; wherein,,
the high-pressure membrane assembly is provided with a water inlet, a water outlet, a concentrated solution outlet and a high-pressure membrane element therein; the water inlet is connected to a main water inlet pipeline through a water inlet pipeline, and a water inlet valve and a variable-frequency high-pressure pump are sequentially arranged in the water inlet pipeline; the concentrated solution outlet is connected with a concentrated solution outlet pipeline, and the concentrated solution outlet pipeline is connected to variable-frequency high-pressure pumps of the present-stage and the subsequent-stage high-pressure membrane units through a proportional valve or an energy recovery pump; the produced water outlet is connected to a water inlet pipeline of each stage of high-pressure membrane unit before the previous stage, and the stage is controlled to return to any stage of high-pressure membrane unit before;
the water outlet of the high-pressure membrane combination of the first-stage high-pressure membrane unit is connected to a water producing tank;
and the variable-frequency high-pressure pump, the proportional valve or the energy recovery pump is electrically connected with the control module.
2. The multi-stage membrane concentration assembly including energy recovery according to claim 1, wherein a cartridge filter is further provided, the cartridge filter being provided in the main water intake pipe, or a plurality of cartridge filters are provided, respectively, in the water intake pipe of each stage of the high-pressure membrane unit.
3. The multi-stage membrane concentration assembly including energy recovery of claim 1 wherein the high pressure membrane element is a roll, disc or tube.
4. The multi-section membrane concentration assembly including energy recovery of claim 1 wherein a pressure sensor and a flowmeter are also provided in the water inlet line of each of the plurality of high pressure membrane units, the pressure sensor and flowmeter being electrically connected to the control module.
5. The multi-section membrane concentration assembly including energy recovery of claim 1 wherein the inlet valve is a ball valve.
6. A concentrating process for a multi-stage membrane concentrating assembly including energy recovery as defined in claim 1, comprising the steps of:
1) The water inflow from the raw water tank is respectively conveyed to an N-level high-pressure membrane unit through a total water inflow pump, pressurized through a variable-frequency high-pressure pump, and then conveyed to a high-pressure membrane combined water inlet, and concentrated through a high-pressure membrane element; during the period, according to the salt interception rate of the high-pressure membrane element, the pressure change of the variable-frequency high-pressure pump is adjusted to control the water yield, so that the concentration of the water produced by each high-pressure membrane unit is lower than that of the water fed in the stage; the salt interception rate of the high-pressure membrane element is 20-99%;
2) After the water inflow is concentrated by each stage of high-pressure membrane element, the concentrated solution passes through a proportional valve or an energy recovery pump, one part of the concentrated solution is mixed with the water inflow part of the next stage by a variable-frequency high-pressure pump of the next stage high-pressure membrane unit, the other part of the concentrated solution is mixed with the water inflow part of the next stage by a variable-frequency high-pressure pump of the present stage high-pressure membrane unit, and the produced water enters a water inlet pipeline of any one stage of high-pressure membrane unit before the previous stage;
3) Concentrate discharged from the last-stage high-pressure membrane unit is collected and discharged after passing through a proportional valve or an energy recovery pump; the water inlet product water which is concentrated by the combination of the N-level high-pressure membrane units is discharged from a water outlet of the first-level high-pressure membrane unit and enters a water production tank.
7. The concentrating process of claim 6 wherein the pressure of each of said high pressure membrane units is adjusted to control the flow of said influent water by adjusting the salt rejection rate of said high pressure membrane unit.
8. The concentrating process of claim 6 wherein the total dissolved solids content in the feed water is greater than 10g/L and each dissolved solids content is less than its saturated solubility.
9. The concentrating process according to claim 6, wherein the pressure of the inlet water in the step 1) is 20-150bar after the inlet water is pressurized by a variable-frequency high-pressure pump.
10. The process of claim 6, wherein the total dissolved solids content in the concentrate is from 50 to 250g/L.
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| CN1546390A (en) * | 2003-12-16 | 2004-11-17 | 天津市海跃水处理高科技有限公司 | Method for concentrating ammonium chloride using reverse osmosis membrane |
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