CN116655058A - Seawater desalination energy-saving system - Google Patents
Seawater desalination energy-saving system Download PDFInfo
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- CN116655058A CN116655058A CN202310852354.8A CN202310852354A CN116655058A CN 116655058 A CN116655058 A CN 116655058A CN 202310852354 A CN202310852354 A CN 202310852354A CN 116655058 A CN116655058 A CN 116655058A
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- 239000013535 sea water Substances 0.000 title claims abstract description 241
- 238000010612 desalination reaction Methods 0.000 title claims abstract description 65
- 238000005265 energy consumption Methods 0.000 claims abstract description 176
- 238000011084 recovery Methods 0.000 claims abstract description 106
- 238000001223 reverse osmosis Methods 0.000 claims abstract description 71
- 238000000034 method Methods 0.000 claims abstract description 56
- 230000008859 change Effects 0.000 claims abstract description 50
- 238000004458 analytical method Methods 0.000 claims abstract description 31
- 235000011449 Rosa Nutrition 0.000 claims abstract description 26
- 230000008569 process Effects 0.000 claims abstract description 15
- 238000004364 calculation method Methods 0.000 claims abstract description 14
- 238000004451 qualitative analysis Methods 0.000 claims abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 53
- 239000012528 membrane Substances 0.000 claims description 45
- 230000001105 regulatory effect Effects 0.000 claims description 32
- 239000012267 brine Substances 0.000 claims description 30
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims description 30
- 239000000243 solution Substances 0.000 claims description 21
- 238000004519 manufacturing process Methods 0.000 claims description 15
- 239000013505 freshwater Substances 0.000 claims description 14
- 239000012530 fluid Substances 0.000 claims description 9
- 230000000630 rising effect Effects 0.000 claims description 8
- 230000006872 improvement Effects 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 239000012466 permeate Substances 0.000 claims description 3
- 238000011033 desalting Methods 0.000 claims description 2
- 150000003839 salts Chemical class 0.000 description 7
- 230000007423 decrease Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000017105 transposition Effects 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/08—Seawater, e.g. for desalination
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/001—Upstream control, i.e. monitoring for predictive control
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
- Y02A20/131—Reverse-osmosis
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention discloses a seawater desalination energy-saving method, which comprises the following steps: step one: simulating the influence of three parameters of sea water temperature, sea water recovery rate and feed sea water concentration on the energy consumption of the system through ROSA software, and performing empirical prediction calculation analysis on the energy consumption in the reverse osmosis process; step two: the influence of the energy recovery device on the energy consumption change of the recovered concentrated seawater is synchronously analyzed; step three: the method has the advantages that the operation stability of an energy recovery device in the system is improved by a qualitative analysis method, the highest working pressure of the system is further improved, so that the energy consumption is reduced, and the method has the characteristics of reducing the total investment cost and reducing the energy consumption.
Description
Technical Field
The invention relates to the technical field of sea water desalination energy conservation, in particular to a sea water desalination energy conservation system.
Background
The sea water desalination technology is one of the best solutions for solving the shortage of fresh water currently acknowledged, sea water is utilized for desalination to produce fresh water, the sea water desalination method currently used is mainly a reverse osmosis membrane method and a distillation method, and the reverse osmosis sea water desalination project mainly aims at direct energy consumption, because salt in sea water and water form stable chemical bonds, the salt and the water are difficult to decompose, a large amount of energy is consumed when water is extracted singly, but the energy consumption of one sea water desalination project comprises indirect energy consumption reflected in an engineering industry chain besides direct energy consumption, the problem of indirect energy consumption existing can be avoided only by analyzing the energy consumption of the whole project from the angle of 'end energy consumption', and a great deal of energy and cost are consumed when the whole sea water desalination project is configured, so that the design of a sea water desalination energy saving system for reducing the total investment cost and reducing the energy consumption is very necessary.
Disclosure of Invention
The invention aims to provide a seawater desalination energy-saving system to solve the problems in the background technology.
In order to solve the technical problems, the invention provides the following technical scheme: an energy-saving method for sea water desalination comprises the following steps:
step one: simulating the influence of three parameters of sea water temperature, sea water recovery rate and feed sea water concentration on the energy consumption of the system through ROSA software, and performing empirical prediction calculation analysis on the energy consumption in the reverse osmosis process;
step two: the influence of the energy recovery device on the energy consumption change of the recovered concentrated seawater is synchronously analyzed;
step three: and desalting the reverse osmosis seawater based on the obtained parameter energy consumption influence and the device energy consumption influence.
According to the technical scheme, the step of empirically predicting, calculating and analyzing the energy consumption of the reverse osmosis process comprises the following steps:
the influence of three parameters of sea water temperature, sea water recovery rate and feed sea water concentration on the energy consumption of the system is simulated and measured by utilizing ROSA software, two parameters are fixed, and the influence rule of the other parameter on the energy consumption is analyzed by utilizing the independent change of the other parameter.
According to the above technical scheme, the step of simulating the influence of three parameters of sea water temperature, sea water recovery rate and feed sea water concentration on the system energy consumption by the ROSA software includes:
the method for simulating and measuring the influence of the sea water temperature on the energy consumption by using the ROSA software comprises the following steps: by fixing the seawater concentration value P and the recovery rate K of the membrane module, the temperature T of the feed seawater is set to be a fixed range change, and the system energy consumption at the momentThe calculation of the value X is commonly:the energy consumption of the system is reduced along with the rising of the temperature of the seawater, namely the rising of the temperature of the seawater in a fixed range can lead the pressure of the system to be reduced along with the rising of the temperature of the seawater;
the method for simulating and measuring the influence of the seawater recovery rate on the energy consumption by using the ROSA software comprises the following steps: fixing the temperature and the concentration of the feed seawater, inputting the seawater recovery rate from small to large within a given range value, and judging the change of the energy consumption of the system along with the improvement of the recovery rate of the membrane component;
the method for simulating and measuring the influence of the concentration of the feed seawater on the energy consumption by using the ROSA software comprises the following steps of: the temperature of the feed seawater and the recovery rate of the membrane component are fixed, the seawater concentration is increased from small to large within a fixed range, the change of the concentration of the feed seawater in the system is judged, and the reverse osmosis difficulty of the membrane component of the system is judged after the seawater concentration is gradually increased.
According to the above technical scheme, the step of analyzing the influence of the energy recovery device on the energy consumption change of the recovered concentrated seawater comprises the following steps:
the total energy consumption of the seawater solution with different parameter concentrations and the total energy consumption of the seawater solution are analyzed by comparing the unit water production energy consumption and the total energy consumption under different seawater concentration conditions, and the change of the total energy consumption curve is judged.
According to the technical scheme, the method for the qualitative control analysis of the state of the energy recovery device comprises the following steps:
the method comprises the steps of adjusting the working pressure of an energy recovery device in a reverse osmosis seawater system by adjusting the rotating speed of a high-pressure pump to indirectly change the flow condition of the energy recovery device, setting the non-working state of the energy recovery device and the working state of the energy recovery device, adjusting the front pressure and the flow of a reverse osmosis membrane in the system, recording the data change of the water yield in the system, and analyzing the change of the energy consumption of the produced water at the moment.
According to the technical scheme, the method for reverse osmosis sea water desalination comprises the following steps:
step 31: after the low-pressure raw seawater passes through a filter from a test water tank, one part of the low-pressure raw seawater enters a high-pressure seawater pump through a flow regulating valve, and the other part of the low-pressure raw seawater enters a low-pressure fresh seawater inlet of an energy recovery device through the flow regulating valve;
step 32: the high-pressure seawater pressurized by the high-pressure pump enters a reverse osmosis membrane assembly to form fresh water, the fresh water is separated out by a flow regulating valve and runs to produce water to flow back to a test water tank, and the high-pressure strong brine which does not permeate the reverse osmosis membrane enters a high-pressure strong brine inlet of a pressure exchanger of the energy recovery device;
step 33: the operation pressure of the system is regulated and controlled by regulating a frequency converter of the high-pressure pump and changing the opening degree of a bypass valve of a high-pressure pipeline, the high-pressure fluid flow of the energy recovery device is regulated by changing the output frequency of the frequency converter of the booster pump, and the low-pressure fluid flow of the energy recovery device is regulated by changing the frequency of the frequency converter of the low-pressure water supply pump and the opening degree of a back pressure valve of pressure-relieved brine;
step 34: in the high-speed rotation state of the energy recovery device, the low-pressure fresh sea water reacts with the high-pressure strong brine to realize the exchange from pressure energy to pressure energy, the high-pressure strong brine is changed into low-pressure strong brine, and the low-pressure strong brine is discharged through a low-pressure strong brine outlet of the energy recovery device and a flow regulating valve;
step 35: the discharged high-pressure fresh seawater enters the energy recovery device through the flow regulating valve to collide with the low-pressure fresh seawater energy to obtain energy, and is changed into high-pressure fresh seawater to enter the booster pump of the energy recovery device, the booster pump is used for realizing the booster pressure, and the pressurized high-pressure fresh seawater is output to the reverse osmosis membrane to be produced in fresh water again.
According to the technical scheme, the seawater desalination energy-saving system comprises:
the parameter energy consumption influence analysis module is used for analyzing the influence of three parameters of sea water temperature, sea water recovery rate and feed sea water concentration on the energy consumption of the sea water desalination system respectively;
the device energy consumption influence analysis module is used for analyzing the energy consumption change influence of the energy recovery device on the recovered concentrated seawater;
and the seawater desalination energy-saving module is used for carrying out reverse osmosis seawater desalination based on the obtained parameter energy consumption influence and the device energy consumption influence.
According to the above technical scheme, the parameter energy consumption influence analysis module includes:
the ROSA software simulation module is used for simulating and measuring the influence of multiple parameters on the system energy consumption by utilizing the ROSA software;
the energy consumption influence rule analysis module is used for fixing two simulated parameter quantities and analyzing the influence rule of the other parameter quantity on the energy consumption by utilizing the independent change of the other parameter quantity;
and the empirical prediction calculation analysis module is used for performing empirical prediction calculation analysis on the energy consumption of the reverse osmosis process.
According to the above technical scheme, the device energy consumption influence analysis module includes:
an energy recovery device module for analyzing an energy recovery device as a load element of high pressure pump output pressure and flow;
the total energy consumption curve change judging module is used for analyzing the total energy consumption of the seawater solution with different parameter concentrations and the total energy consumption of the seawater solution and judging the change of the total energy consumption curve;
the water production energy consumption change analysis module is used for analyzing the water production energy consumption change of the system at the moment when the pressure and the flow rate of the reverse osmosis membrane are adjusted;
the qualitative analysis module is used for setting the working state of the energy recovery device in the system to perform qualitative analysis on the influence on energy consumption.
According to the technical scheme, the seawater desalination energy-saving module comprises:
the reverse osmosis sea water desalination module is used for carrying out reverse osmosis sea water desalination;
the comprehensive level reaction module is used for analyzing the comprehensive level of the reverse osmosis sea water desalination system according to the ratio of the energy output and the output of the sea water desalination system;
the unit energy consumption curve acquisition module is used for acquiring unit energy consumption curves under different seawater concentrations.
Compared with the prior art, the invention has the following beneficial effects: in the present invention, the number of the components,
1. the influence of three parameters of sea water temperature, sea water recovery rate and feed sea water concentration on energy consumption is simulated and measured by utilizing ROSA software, two parameters are fixed, the influence rule of the other parameter on the energy consumption is analyzed by utilizing the independent change of the other parameter, the energy consumption in the reverse osmosis process is subjected to empirical prediction calculation analysis, the energy consumption can be reduced in the system, the later parameter setting can be more reasonably carried out, and meanwhile, the running cost is saved;
2. based on qualitative analysis of the working state of the energy recovery device in the system, desalination of reverse osmosis seawater is carried out based on the obtained parameter energy consumption influence and the device energy consumption influence, and relevant configuration is analyzed and controlled, so that the inlet and outlet flow of the energy recovery device reaches an equilibrium state, the operation stability of the energy recovery device is improved, the highest working pressure of the system is improved, and the unit water production energy consumption of the system is reduced.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention. In the drawings:
FIG. 1 is a flow chart of a method for saving energy in desalination of sea water according to a first embodiment of the present invention;
fig. 2 is a schematic diagram of module composition of a seawater desalination energy-saving system according to a second embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Embodiment one: fig. 1 is a flowchart of a method for saving energy in sea water desalination according to a first embodiment of the present invention, where the method may be implemented by a system for saving energy in sea water desalination according to the first embodiment, and as shown in fig. 1, the method specifically includes the following steps:
step one: simulating the influence of three parameters of sea water temperature, sea water recovery rate and feed sea water concentration on the energy consumption of the system through ROSA software, and performing empirical prediction calculation analysis on the energy consumption in the reverse osmosis process;
in the embodiment of the invention, the principle of the reverse osmosis process is as follows: under the drive of pressure, a solvent serving as water enters a low-pressure side of produced water through a reverse osmosis membrane, other components including salt and impurities in the solution are blocked at a high-pressure side of the membrane and discharged along with concentrated seawater, so that an effective separation process is achieved, fresh seawater is pumped into a pretreatment device by utilizing a seawater booster pump in ROSA software, pretreated qualified feed seawater is pressurized by the high-pressure pump, further pressurized to a seawater desalination rated operating pressure by utilizing a pumped differential pressure exchange type energy recovery device, then enters a reverse osmosis membrane assembly, is led out from a membrane stack after passing through a desalination water mobile phone of the reverse osmosis membrane, and is discharged out of the system after exchanging residual pressure energy, therefore, the influence of three parameters of seawater temperature, seawater recovery rate and feed seawater concentration on energy consumption is simulated and measured by utilizing ROSA software, two parameters are fixed, and the influence rule of the other parameters on energy consumption is analyzed by utilizing the independent change of the other parameters;
the method for simulating and measuring the influence of the sea water temperature on the energy consumption by using the ROSA software is as follows: by fixing the seawater concentration value P and the recovery rate K of the membrane component, the temperature T of the feed seawater is set to be a fixed range change, and the calculation of the system energy consumption value X at the moment is commonly:that is, the system energy consumption decreases with the rising of the seawater temperature, the activity increases linearly when the temperature exceeds the threshold value of the range because the temperature is in the range, the seawater permeability increases, the salt content of the finished water increases, the change of the permeability of the reverse osmosis membrane in the reverse osmosis membrane component with the rising of the temperature is judged under the condition that the seawater concentration value and the recovery rate of the membrane component are fixed, and when the seawater temperature rises in the fixed range, more salt passes through the reverse osmosis membrane, namely the seawaterAn increase in water temperature within a fixed range will cause the system pressure to drop with it;
the method for simulating and measuring the influence of the seawater recovery rate on the energy consumption by using the ROSA software is as follows: the method comprises the steps of fixing the temperature of feed seawater and the concentration of the feed seawater, inputting the seawater recovery rate from small to large within a given range value, judging the change of energy consumption of a system along with the improvement of the recovery rate of a membrane component, judging the decrease of energy consumption of the system, namely the decrease of energy consumption of the system, when the recovery rate of the membrane component is gradually increased within the range value, and judging the increase of energy consumption of the system, namely the increase of energy consumption of the system, when the recovery rate of the membrane component is gradually increased within the range value, the decrease of energy consumption of the system, namely the increase of energy consumption of the system, wherein the increase of raw material water in the unit volume is the increase of the recovery rate of the seawater;
exemplary, the method for simulating and measuring the influence of the concentration of the feed seawater on the energy consumption by using the ROSA software is as follows: the temperature of the feed seawater and the recovery rate of the membrane component are fixed, the concentration of the seawater is increased from small to large in a fixed range, the change of the concentration of the feed seawater in the system is judged, the reverse osmosis difficulty of the membrane component of the system is judged after the concentration of the seawater is gradually increased, when the concentration is higher and the system pressure is also higher, the electricity consumption of the high-pressure pump in the system is also increased, so that the energy consumption of unit finished water in the system is also increased, when the concentration is higher and the system pressure is lower, the electricity consumption of the high-pressure pump in the system is kept in the existing range, and the energy consumption of the unit finished water in the system is kept in a normal state, namely the energy consumption is not increased.
Step two: the influence of the energy recovery device on the energy consumption change of the recovered concentrated seawater is synchronously analyzed;
in the embodiment of the invention, the energy consumption of the reverse osmosis sea water desalination system mainly comprises two parts of energy consumption for generating high-pressure water by a motor-driven high-pressure sea water pump and pressure energy exchange and pressurization energy consumption generated by a motor-driven energy recovery device, the energy recovery device is coupled in the reverse osmosis system and mainly realizes that the pressure of low-pressure sea water is increased to the water inlet pressure of a reverse osmosis membrane, in the pressurization process, the pressure energy of high-pressure brine can be directly transmitted to the pressurized sea water, the ratio of the pressure energy of the pressurized sea water to the pressure energy of the high-pressure brine is called as the direct efficiency of the pressurization process, the total energy consumption of sea water solutions with different parameter concentrations and the total energy consumption of sea water solutions are analyzed by comparing the unit water production energy consumption and the total energy consumption under different sea water concentration conditions, judging the change of the total energy consumption curve, when the rotating speed of the energy recovery device is kept to be constant, the total energy consumption is expressed as the energy consumption of the high-pressure pump, when the total energy consumption curve is continuously increased along with the increase of the rotating speed of the high-pressure pump, the total energy consumption is increased along with the increase of the rotating speed of the high-pressure pump, at the moment, the water production energy consumption curve of the system shows linear positive correlation, when the fresh water yield of the system is more, the unit water production energy consumption is smaller, namely the concentration of the seawater solution in the system is higher, the load pressure of the high-pressure pump in the system is required to be higher, namely the energy consumption of the high-concentration seawater solution is higher than the total energy consumption of the low-concentration seawater solution, the salt content of the water is changed, the energy consumption and the working pressure of the system are also increased along with the increase of the salt content of the water in a linear proportion, namely the more required energy of the raw water is higher;
the method comprises the steps of taking an energy recovery device as a load element for outputting pressure and flow of a high-pressure pump when a reverse osmosis seawater desalination system works, increasing the rotating speed of the high-pressure pump on the premise that the rotating speed of the energy recovery device is certain, increasing the through-flow of the high-pressure pump, increasing the inlet flow of high-pressure strong brine of the energy recovery device, namely, increasing high-pressure fluid and low-pressure fluid which are subjected to pressure energy exchange simultaneously in the device, increasing the load, and increasing the working pressure of the system, so that the working pressure of the energy recovery device in the reverse osmosis seawater system is regulated by indirectly changing the flow condition of the energy recovery device by regulating the rotating speed of the high-pressure pump, setting the energy recovery device to be not working, fully opening a raw water return valve to test the water yield and system energy consumption of a reverse osmosis membrane group, enabling fresh seawater in the system to enter the group through the raw water pump and the high-pressure pump by opening the raw water pump, regulating the conical valve to be externally connected with a strong brine pipeline to return a seawater tank, establishing pressure before the conical valve reverse osmosis membrane group, generating fresh water when the front pressure reaches the front pressure of the reverse osmosis membrane, continuously increasing the front pressure of the reverse osmosis membrane, increasing the fresh water generation flow, regulating the front pressure, regulating the opening degree and the high-pressure of the high-pressure pump, and recording the change of the reverse osmosis membrane and the water yield and the energy consumption, and analyzing the change of the data in the reverse osmosis membrane;
the method comprises the steps of setting a raw water pump, a high-pressure pump and an energy recovery device to work normally, adjusting the rotation speed of each motor to balance the flow of the energy recovery device, measuring by taking pressure energy recovery and average energy consumption reduction as cores, setting low-fixed concentration seawater and standard concentration two seawater solutions by changing parameters of flow, pressure before a film and fresh seawater concentration, recording flow pressure readings, directly measuring artificial seawater concentrations of a high-pressure strong brine outlet, a low-pressure strong brine outlet and a low-pressure fresh seawater inlet of the energy recovery device by using a salinity measuring instrument, calculating fluid mixing rate of the energy recovery device, and analyzing water production energy consumption change of the energy recovery device under different parameter data.
Step three: desalination of reverse osmosis seawater is carried out based on the obtained parameter energy consumption influence and the device energy consumption influence;
in the embodiment of the invention, the method for reverse osmosis sea water desalination comprises the following steps:
step 31: after the low-pressure raw seawater passes through a filter from a test water tank, one part of the low-pressure raw seawater enters a high-pressure seawater pump through a flow regulating valve, and the other part of the low-pressure raw seawater enters a low-pressure fresh seawater inlet of an energy recovery device through the flow regulating valve;
step 32: the high-pressure seawater pressurized by the high-pressure pump enters a reverse osmosis membrane assembly to form fresh water, the fresh water is separated out by a flow regulating valve and runs to produce water to flow back to a test water tank, and the high-pressure strong brine which does not permeate the reverse osmosis membrane enters a high-pressure strong brine inlet of a pressure exchanger of the energy recovery device;
step 33: the operation pressure of the system is regulated and controlled by regulating a frequency converter of the high-pressure pump and changing the opening degree of a bypass valve of a high-pressure pipeline, the high-pressure fluid flow of the energy recovery device is regulated by changing the output frequency of the frequency converter of the booster pump, and the low-pressure fluid flow of the energy recovery device is regulated by changing the frequency of the frequency converter of the low-pressure water supply pump and the opening degree of a back pressure valve of pressure-relieved brine;
step 34: in the high-speed rotation state of the energy recovery device, the low-pressure fresh sea water reacts with the high-pressure strong brine to realize the exchange from pressure energy to pressure energy, the high-pressure strong brine is changed into low-pressure strong brine, and the low-pressure strong brine is discharged through a low-pressure strong brine outlet of the energy recovery device and a flow regulating valve;
step 35: the discharged high-pressure fresh seawater enters a booster pump of the energy recovery device after being subjected to energy collision by a flow regulating valve, is changed into high-pressure fresh seawater, and enters the booster pump of the energy recovery device, the booster pump is used for realizing booster, and the pressurized high-pressure fresh seawater is output to the front of a reverse osmosis membrane to be produced in fresh water again;
the unit energy consumption in the reverse osmosis sea water desalination system shows the ratio of the energy output and the output of the sea water desalination system, directly represents the comprehensive level of the reverse osmosis sea water desalination system, obtains a unit energy consumption curve under different sea water concentrations, periodically leads out low-pressure sea water at the transposition moment of a switcher by adjusting the existing reverse osmosis sea water desalination system, relieves the pressure and flow fluctuation of the low-pressure sea water, gradually reduces the unit water production energy consumption of the system along with the increase of the rotating speed of a high-pressure pump, gradually reduces the slope of the curve, and tends to be gentle, the unit energy consumption of the high-concentration sea water solution gradually reduces the difference value between the unit energy consumption of the low-concentration sea water solution and the unit water production energy consumption of the low-concentration sea water solution, so that the inlet and outlet flow of an energy recovery device can reach an equilibrium state, the operation stability of the energy recovery device is improved, and the highest working pressure of the system is further improved.
Embodiment two: the second embodiment of the present invention provides an energy saving system for sea water desalination, fig. 2 is a schematic diagram of module composition of the energy saving system for sea water desalination provided by the second embodiment of the present invention, as shown in fig. 2, the system includes:
the parameter energy consumption influence analysis module is used for analyzing the influence of three parameters of sea water temperature, sea water recovery rate and feed sea water concentration on the energy consumption of the sea water desalination system respectively;
the device energy consumption influence analysis module is used for analyzing the energy consumption change influence of the energy recovery device on the recovered concentrated seawater;
and the seawater desalination energy-saving module is used for carrying out reverse osmosis seawater desalination based on the obtained parameter energy consumption influence and the device energy consumption influence.
In some embodiments of the invention, the parameter energy consumption impact analysis module comprises:
the ROSA software simulation module is used for simulating and measuring the influence of multiple parameters on the system energy consumption by utilizing the ROSA software;
the energy consumption influence rule analysis module is used for fixing two simulated parameter quantities and analyzing the influence rule of the other parameter quantity on the energy consumption by utilizing the independent change of the other parameter quantity;
and the empirical prediction calculation analysis module is used for performing empirical prediction calculation analysis on the energy consumption of the reverse osmosis process.
In some embodiments of the invention, the device energy consumption impact analysis module comprises:
an energy recovery device module for analyzing an energy recovery device as a load element of high pressure pump output pressure and flow;
the total energy consumption curve change judging module is used for analyzing the total energy consumption of the seawater solution with different parameter concentrations and the total energy consumption of the seawater solution and judging the change of the total energy consumption curve;
the water production energy consumption change analysis module is used for analyzing the water production energy consumption change of the system at the moment when the pressure and the flow rate of the reverse osmosis membrane are adjusted;
the qualitative analysis module is used for setting the working state of the energy recovery device in the system to perform qualitative analysis on the influence on energy consumption.
In some embodiments of the invention, a seawater desalination energy saving module comprises:
the reverse osmosis sea water desalination module is used for carrying out reverse osmosis sea water desalination;
the comprehensive level reaction module is used for analyzing the comprehensive level of the reverse osmosis sea water desalination system according to the ratio of the energy output and the output of the sea water desalination system;
the unit energy consumption curve acquisition module is used for acquiring unit energy consumption curves under different seawater concentrations.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Finally, it should be noted that: the foregoing description is only a preferred embodiment of the present invention, and the present invention is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present invention has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An energy-saving method for sea water desalination is characterized in that: the method comprises the following steps:
step one: simulating the influence of three parameters of sea water temperature, sea water recovery rate and feed sea water concentration on the energy consumption of the system through ROSA software, and performing empirical prediction calculation analysis on the energy consumption in the reverse osmosis process;
step two: the influence of the energy recovery device on the energy consumption change of the recovered concentrated seawater is synchronously analyzed;
step three: and desalting the reverse osmosis seawater based on the obtained parameter energy consumption influence and the device energy consumption influence.
2. The energy saving method for sea water desalination according to claim 1, characterized in that: the step of empirically predicting, calculating and analyzing the energy consumption of the reverse osmosis process comprises the following steps:
the influence of three parameters of sea water temperature, sea water recovery rate and feed sea water concentration on the energy consumption of the system is simulated and measured by utilizing ROSA software, two parameters are fixed, and the influence rule of the other parameter on the energy consumption is analyzed by utilizing the independent change of the other parameter.
3. The energy saving method for sea water desalination according to claim 2, characterized in that: the step of simulating the influence of three parameters of sea water temperature, sea water recovery rate and feed sea water concentration on the energy consumption of the system by ROSA software comprises the following steps:
the method for simulating and measuring the influence of the sea water temperature on the energy consumption by using the ROSA software comprises the following steps: by fixing the seawater concentration value P and the recovery rate K of the membrane component, the temperature T of the feed seawater is set to be a fixed range change, and the calculation of the system energy consumption value X at the moment is commonly:the energy consumption of the system is reduced along with the rising of the temperature of the seawater, namely the rising of the temperature of the seawater in a fixed range can lead the pressure of the system to be reduced along with the rising of the temperature of the seawater;
the method for simulating and measuring the influence of the seawater recovery rate on the energy consumption by using the ROSA software comprises the following steps: fixing the temperature and the concentration of the feed seawater, inputting the seawater recovery rate from small to large within a given range value, and judging the change of the energy consumption of the system along with the improvement of the recovery rate of the membrane component;
the method for simulating and measuring the influence of the concentration of the feed seawater on the energy consumption by using the ROSA software comprises the following steps of: the temperature of the feed seawater and the recovery rate of the membrane component are fixed, the seawater concentration is increased from small to large within a fixed range, the change of the concentration of the feed seawater in the system is judged, and the reverse osmosis difficulty of the membrane component of the system is judged after the seawater concentration is gradually increased.
4. A method for desalinating seawater and saving energy according to claim 3, wherein: the step of analyzing the influence of the energy recovery device on the energy consumption change of the recovered concentrated seawater comprises the following steps:
the total energy consumption of the seawater solution with different parameter concentrations and the total energy consumption of the seawater solution are analyzed by comparing the unit water production energy consumption and the total energy consumption under different seawater concentration conditions, and the change of the total energy consumption curve is judged.
5. The energy-saving method for sea water desalination according to claim 4, wherein: the method for the qualitative control analysis of the state of the energy recovery device comprises the following steps:
the method comprises the steps of adjusting the working pressure of an energy recovery device in a reverse osmosis seawater system by adjusting the rotating speed of a high-pressure pump to indirectly change the flow condition of the energy recovery device, setting the non-working state of the energy recovery device and the working state of the energy recovery device, adjusting the front pressure and the flow of a reverse osmosis membrane in the system, recording the data change of the water yield in the system, and analyzing the change of the energy consumption of the produced water at the moment.
6. The energy-saving method for sea water desalination according to claim 5, characterized in that: the method for reverse osmosis sea water desalination comprises the following steps:
step 31: after the low-pressure raw seawater passes through a filter from a test water tank, one part of the low-pressure raw seawater enters a high-pressure seawater pump through a flow regulating valve, and the other part of the low-pressure raw seawater enters a low-pressure fresh seawater inlet of an energy recovery device through the flow regulating valve;
step 32: the high-pressure seawater pressurized by the high-pressure pump enters a reverse osmosis membrane assembly to form fresh water, the fresh water is separated out by a flow regulating valve and runs to produce water to flow back to a test water tank, and the high-pressure strong brine which does not permeate the reverse osmosis membrane enters a high-pressure strong brine inlet of a pressure exchanger of the energy recovery device;
step 33: the operation pressure of the system is regulated and controlled by regulating a frequency converter of the high-pressure pump and changing the opening degree of a bypass valve of a high-pressure pipeline, the high-pressure fluid flow of the energy recovery device is regulated by changing the output frequency of the frequency converter of the booster pump, and the low-pressure fluid flow of the energy recovery device is regulated by changing the frequency of the frequency converter of the low-pressure water supply pump and the opening degree of a back pressure valve of pressure-relieved brine;
step 34: in the high-speed rotation state of the energy recovery device, the low-pressure fresh sea water reacts with the high-pressure strong brine to realize the exchange from pressure energy to pressure energy, the high-pressure strong brine is changed into low-pressure strong brine, and the low-pressure strong brine is discharged through a low-pressure strong brine outlet of the energy recovery device and a flow regulating valve;
step 35: the discharged high-pressure fresh seawater enters the energy recovery device through the flow regulating valve to collide with the low-pressure fresh seawater energy to obtain energy, and is changed into high-pressure fresh seawater to enter the booster pump of the energy recovery device, the booster pump is used for realizing the booster pressure, and the pressurized high-pressure fresh seawater is output to the reverse osmosis membrane to be produced in fresh water again.
7. A seawater desalination energy saving system for performing a seawater desalination energy saving method as claimed in claim 1, wherein: the system comprises:
the parameter energy consumption influence analysis module is used for analyzing the influence of three parameters of sea water temperature, sea water recovery rate and feed sea water concentration on the energy consumption of the sea water desalination system respectively;
the device energy consumption influence analysis module is used for analyzing the energy consumption change influence of the energy recovery device on the recovered concentrated seawater;
and the seawater desalination energy-saving module is used for carrying out reverse osmosis seawater desalination based on the obtained parameter energy consumption influence and the device energy consumption influence.
8. The energy saving system for desalinating sea water of claim 7, wherein: the parameter energy consumption influence analysis module comprises:
the ROSA software simulation module is used for simulating and measuring the influence of multiple parameters on the system energy consumption by utilizing the ROSA software;
the energy consumption influence rule analysis module is used for fixing two simulated parameter quantities and analyzing the influence rule of the other parameter quantity on the energy consumption by utilizing the independent change of the other parameter quantity;
and the empirical prediction calculation analysis module is used for performing empirical prediction calculation analysis on the energy consumption of the reverse osmosis process.
9. The energy saving system for desalinating sea water of claim 8, wherein: the device energy consumption influence analysis module comprises:
an energy recovery device module for analyzing an energy recovery device as a load element of high pressure pump output pressure and flow;
the total energy consumption curve change judging module is used for analyzing the total energy consumption of the seawater solution with different parameter concentrations and the total energy consumption of the seawater solution and judging the change of the total energy consumption curve;
the water production energy consumption change analysis module is used for analyzing the water production energy consumption change of the system at the moment when the pressure and the flow rate of the reverse osmosis membrane are adjusted;
the qualitative analysis module is used for setting the working state of the energy recovery device in the system to perform qualitative analysis on the influence on energy consumption.
10. The energy saving system for desalinating sea water of claim 9, wherein: the seawater desalination energy-saving module comprises:
the reverse osmosis sea water desalination module is used for carrying out reverse osmosis sea water desalination;
the comprehensive level reaction module is used for analyzing the comprehensive level of the reverse osmosis sea water desalination system according to the ratio of the energy output and the output of the sea water desalination system;
the unit energy consumption curve acquisition module is used for acquiring unit energy consumption curves under different seawater concentrations.
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| CN117236083A (en) * | 2023-11-16 | 2023-12-15 | 山东电力建设第三工程有限公司 | Reverse osmosis sea water desalination water balance calculation method and device |
| CN117236083B (en) * | 2023-11-16 | 2024-02-09 | 山东电力建设第三工程有限公司 | Reverse osmosis sea water desalination water balance calculation method and device |
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