CN100374377C - Sea water desalting method - Google Patents

Sea water desalting method Download PDF

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Publication number
CN100374377C
CN100374377C CNB2006100440986A CN200610044098A CN100374377C CN 100374377 C CN100374377 C CN 100374377C CN B2006100440986 A CNB2006100440986 A CN B2006100440986A CN 200610044098 A CN200610044098 A CN 200610044098A CN 100374377 C CN100374377 C CN 100374377C
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China
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water tank
water
seawater
icing
subsystem
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CNB2006100440986A
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Chinese (zh)
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CN1880236A (en
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田小亮
孙晖
曲源
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青岛大学
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A20/00Water conservation; Efficient water supply; Efficient water use
    • Y02A20/10Relating to general water supply, e.g. municipal or domestic water supply
    • Y02A20/124Water desalination
    • Y02A20/126Water desalination characterized by the method
    • Y02A20/132Freezing

Abstract

The present invention relates to sea water desalting method which applies the closed type heat pump circulation artificial indirect refrigerating technology to realize high efficiency and energy saving. The present invention comprises seven working steps of the feeding of sea water, the transportation and the discharge of strong brine, the transportation and the discharge of finished water, the washing of ice layers, heat pump cycle, auxiliary cooling and central control, and the seven working steps respectively from seven subsystems which are connected with two icing water tanks by water vapor to form a system device capable of realizing sea water desalination. The system capable continuously output fresh water can be formed by the reciprocating circulation according to the set working operation. An evaporator and a condenser of a closed type heat pump circulation system are organically with the manual indirect refrigerating sea water desalting system, the interchange of the functions of the evaporator and the condenser can be realized by a four-way valve, and ice crystal can be removed and cold can be recovered from the surface of a heat exchanger. The method has the advantages of simple and reliable technological process, simple structure of the use device, good energy-saving effect, low operation cost, favorable commercial process and high desalting quality.

Description

A kind of method for desalting seawater

Technical field:

The present invention relates to a kind of method for desalting seawater, especially a kind of novel method of using the energy-efficient sea water desaltination of the artificial indirect refrigeration technology realization of closed heat pump cycle.

Technical background:

At present, realized that in the world the sea water desaltination utilisation technology that large-scale commercial applications is produced mainly is Re Fa and embrane method, be called distillation method and reverse osmosis method again.Distillation method becomes seawater into steam exactly, steam cooling and obtain high purity fresh water.According to transpiration-cooled mode difference, distillation method is divided into three kinds of multistage flash evaporation, multi-effect distilling and vapour compression distillations (also claiming calms the anger steams slide) usually.Wherein, multistage flash evaporation is that hot sea water is reduced pressure suddenly, produces steam and obtains fresh water.Multi-effect distilling is in steam cooling, continues evaporation and then obtains fresh water.Vapour compression distillation method principle of work is: after steam was compressed, increased pressure, temperature also rose thereupon.Around this principle, the mechanical work of compressor can be converted into the evaporation of seawater necessary energy.For two effect vapour compression water distilling apparatus, the seawater that the available first secondary steam heating second of imitating is imitated; But the pressure and temperature of second secondary steam of imitating is all lower, must improve after its pressure and temperature with compressor, just can be used for heating first seawater of imitating.The heat power efficiency of vapour compression distillation seawater desalination method is more much higher than other two kinds of distillation method, and can directly use diesel engine driven, and unit volume output height is applicable to the condition of naval vessels, island and field operations very much.But it is, generally more suitable with the scale of producing daily below a few kiloton fresh water because the restriction of machine capacity by compression presses the output of decatize slip device to be restricted at present.Reverse osmosis method is exactly under certain pressure (60 kg/cm), and seawater is pressed into reverse osmosis membrane, and this film only allows the water molecules in the seawater to see through, and most molecules of salt are stopped, thereby obtains fresh water.

With regard to present technology, for reverse osmosis seawater desalting, the factor that influences the cost maximum is an electricity expense usefulness, secondly is medicament expense and film replacement charge.For low temperature multiple-effect distillation and multistage flash evaporation sea water desaltination, the factor that influences the cost maximum is the steam expense, secondly is that electricity expense is used.Cutting down the consumption of energy is the problem that sea water desaltination can't be avoided, and also is one of key factor that reduces the sea water desaltination cost.Seeking a kind of less energy-consumption and produce the method for fresh water, is human direction of making great efforts in the sea water desaltination field.

Also have a kind of method that can realize sea water desaltination--cold method: seawater is when icing, and salinity is excluded outside ice crystal, after the ice crystal washing, separating, melt, just obtains fresh water.Because the heat of fusion of water only has 334.4kJ/kg, be about water the latent heat of vaporization 1/7, so than adopting hot method realization sea water desaltination to cut down the consumption of energy greatly.

Press the approach difference that ice crystal forms, cold method is divided natural cold method and two kinds of artificial cold methods again, and artificial cold method is divided indirect freezing method and two kinds of direct cold methods, because people think always: adopt the indirect freezing method heat transfer efficiency not high, and need very big heat transfer area, simultaneously, take off ice crystal from heat-transfer surface, so easy damaged metal wall is to the applied research of this aspect seldom; Study direct cold method and mainly concentrate on, the direct contact freezing of refrigerant, vacuum freezing vapour compression method, vacuum freezing vapor absorption method, vacuum freezing-vapor condensation method, vacuum freezing high pressure melted ice crystal method, the heterogeneous transformation method of vacuum freezing or the like have been proposed respectively, although these methods were just studied since the sixties in 20th century, but commercial applications not yet up to now.

Summary of the invention:

The objective of the invention is to overcome the shortcoming that exists in the existing desalination technology, by utilizing energy-efficient heat pump techniques, propose a kind ofly can resolve the variety of issue that exists in the indirect freezing method, realize the indirect refrigeration method for desalting seawater of low-cost, less energy-consumption and low working cost.This method is simplified the structure of sea water desalinating plant as far as possible, reduces the cost of sea water desalinating plant, simultaneously, uses high-efficiency energy-saving technology, reduces the energy consumption and the running cost of desalting process as far as possible, realizes energy-efficient sea water desaltination.

To achieve these goals, the present invention proposes and a kind of the heat pump energy-conserving technique to high-efficiency is applied to artificial indirect refrigeration seawater desalination system method, this inventive method comprises seven subsystems that charging seawater, strong brine conveying and discharging, the conveying of product water and discharging, ice sheet washing, heat pump cycle, auxiliary cooling and central authorities' control constitute respectively, and seven subsystems are communicated with according to sea water desaltination principle aqueous vapor and are communicated with the system and device that formation realizes sea water desaltination again with two icing water tank aqueous vapors; Two icing water tanks are arranged up and down, constitute high-order water tank and the icing water tank of low level of freezing, the vaporizer of closed heat pump circulating system and condenser are placed on respectively in two icing water tanks, the vaporizer of auxiliary cooling subsystem is an interchanger with high-order interchanger organic assembling of freezing water tank, forms the system of continuous output fresh water according to the operation operation reciprocation cycle of setting; Vaporizer, condenser and the artificial indirect refrigeration seawater desalination system of closed circulating heat pump system are combined, and the four-way valve by closed heat pump circulating system, realized the exchange function of vaporizer and condenser easily, thereby high efficiente callback utilizes the cold of emitting in the ice sheet thaw process, reduces the energy consumption of desalting process significantly.

When system starts, earlier seawater is added the high-order water tank that freezes, open the auxiliary cooling subsystem, vaporizer by this system forms ice sheet with the seawater in the icing water tank of a high position, after treating that ice sheet reaches certain thickness, close the auxiliary cooling subsystem, open the seawater bleed valve of elevated tank, allow the seawater that does not freeze flow into the icing water tank of low level automatically from the icing water tank of a high position by action of gravity; After treating that seawater has flowed, start ice sheet washing subsystem, with fresh water seawater flushing for some time with the ice sheet surface, treat that wash-down water all flows out the high-order water tank that freezes after, close the brine discharge valve of the high-order water tank that freezes, start the heat pump cycle subsystem, this system will absorb heat from the seawater that flow into the icing water tank of low level, make it form ice sheet, simultaneously the heat that obtains be delivered to the interchanger of elevated tank, the ice sheet of the high-order water tank that freezes is melted, form fresh water; After all ice sheets melt, close the heat pump cycle subsystem, open the fresh water valve of the high-order water tank that freezes, the seawater bleed valve and the charging seawater water pump of the icing water tank of low level simultaneously, fresh water and the strong brine charging sea water cooler of flowing through, after emitting cold, fresh water enters the fresh water water tank, and strong brine is discharged system, and the charging seawater that is cooled enters in the buffer memory case; After treating to freeze low level the seawater of water tank having flowed, start ice sheet washing subsystem, with fresh water that the seawater flushing on ice sheet surface is clean, treat that wash-down water flows out all that low level freezes that water tank, fresh water discharging finish, after the seawater of buffer memory water tank reaches water level and requires, fresh water valve, the low level of closing the high-order water tank that the freezes seawater bleed valve and the charging seawater water pump of water tank that freeze; Then, open the water discharge valve of baffle-box, the charging seawater that is cooled is charged into the high-order water tank that freezes, then, allow the four-way valve of heat pump cycle subsystem change direction, start the heat pump cycle subsystem once more, interchanger in the high-order water tank that freezes changes the vaporizer of this heat pump into, from the seawater of the icing water tank of a high position, absorb heat, form new ice sheet, simultaneously, the interchanger in the icing water tank of low level is as the condenser of heat pump, with the ice sheet of the icing water tank of heat transferred low level, it is melted produce fresh water; After the ice sheet of the icing water tank of low level all melts, close the heat pump cycle subsystem, open low level freeze the fresh water discharge solenoid valve and the charging seawater water pump of water tank, allow fresh water enter the charging sea water cooler, flow in the fresh water water tank after cold being offered the seawater that newly advances from the low level water tank that freezes; After the whole outflows of the fresh water of the icing water tank of low level, close fresh water discharge solenoid valve and charging seawater water pump, open the seawater bleed valve of the icing water tank of a high position, allow icing seawater lean on action of gravity to flow into the icing water tank of low level automatically from the icing water tank of a high position; After treating that seawater has flowed, start ice sheet washing subsystem, with fresh water seawater flushing for some time with the icing water tank ice sheet surface of a high position, after treating that wash-down water all flows out the high-order water tank that freezes, close the brine discharge valve of the icing water tank of low level, allow the four-way valve of heat pump cycle subsystem change direction, start the heat pump cycle subsystem, this system will absorb heat from the seawater of the icing water tank of low level, make it form ice sheet, simultaneously the heat that obtains is delivered to the interchanger of the high-order water tank that freezes, the ice sheet of the high-order water tank that freezes is melted, form fresh water; So move in circles, constantly produce fresh water.

Charging seawater subsystem of the present invention is sent the charging seawater into the high-order water tank that freezes, and reclaims the strong brine of discharge system and the cold of fresh water simultaneously; Strong brine is carried with the discharging subsystem strong brine of two icing water tanks is discharged, and the cold of the strong brine that the water tank that simultaneously low level frozen is discharged passes to the charging seawater, realizes the recovery of cold; Product water is carried with the discharging subsystem product water of two icing water tanks is delivered to the product water tank, simultaneously its cold is passed to the charging seawater, realizes the recovery of cold; Ice sheet washing subsystem is washed the seawater on surface off, and the fresh water quality is further improved; The heat pump cycle subsystem is realized seawater icing removal salinity by the vaporizer of heat pump, utilize its condenser to realize that the thawing of ice sheet forms fresh water simultaneously, utilize the commutation effect of four-way valve again, the high-order desalting process that freezes water tank and the icing water tank of low level is combined, realize energy-efficient desalting process; The auxiliary cooling subsystem forms primary ice sheet in a high position is frozen water tank, the desalting process of heat pump cycle subsystem is begun, and after the heat pump cycle subsystem work, make the auxiliary cooling subsystem work, with the cold of replenish loss, make the sea water desaltination amount stable; Central authorities' control subsystem makes each subsystem or step organic assembling in chronological order, controls the vaporization temperature of heat pump circulating system and auxiliary cooling system simultaneously.

The present invention organically combines vaporizer, condenser and the artificial indirect refrigeration seawater desalination system of closed heat pump circulating system, by the exchange function of four-way valve realization vaporizer and condenser, realizes removing ice crystal and reclaiming cold from heat exchanger surface.

The present invention adopts strong brine, product water discharging energy recovery, and by strong brine, product water and the heat exchange of charging seawater organic assembling that the icing water tank in high and low position is discharged, the realization energy recovery is supplied with seawater temperature with reducing.

Be separately installed with the needed with ribbing interchanger of freezing process in two icing water tanks among the present invention, this interchanger has enlarged effective heat exchange area or icing area significantly, solved in the former indirect refrigeration method for desalting seawater and to be difficult for enlarging heat-transfer surface and can't removing heat fast, formed the difficult problem of ice crystal as early as possible.

Heat pump cycle in the vaporizer of auxiliary cooling subsystem of the present invention and the icing water tank is with the shared identical hot fin organic composition one of interchanger, and its condenser is air-cooled or water-cooled.

The present invention compared with prior art has the following advantages:

The one, compare with hot method sea water desaltination, because the heat of fusion of water only is 1/7 of a vaporization heat, can cut down the consumption of energy significantly; Simultaneity factor is moved under normal pressure, no vacuum-sealing requirement and vacuum-pumping system, and simple in structure and easy realization, cost reduces significantly;

The 2nd, compare with the embrane method sea water desaltination, need not seawater is carried out complicated pretreatment, do not use pharmaceutical chemicals, can not produce and pollute seawater; Also need not seawater is carried out pressure treatment, system is simple and energy consumption is low;

The 3rd, to compare with direct cold method, no refrigeration agent contacts with water, does not have the pollution of refrigeration agent to fresh water and seawater; Moving and sepn process of no mixture of ice and water, system is more simple and reliable;

The 4th, compare with original indirect freezing method, the present invention utilizes the commutation of four-way valve in the heat pump cycle subsystem, make two icing water tanks realize the combination of freezing process and ice sheet thaw process, not only effectively utilized the cold energy of ice sheet thaw process, improved the efficient of heat pump cycle, and thoroughly solved the problem that can't take off ice crystal from heat-transfer surface that former indirect freezing method exists, realized energy-efficient artificial freezing sea water desaltination;

The 5th, compare with original indirect freezing method, be separately installed with the needed with ribbing interchanger of freezing process in 2 icing water tanks of the present invention, the interchanger of the type has enlarged effective heat exchange area (area freezes) significantly, solved in the former indirect refrigeration method for desalting seawater and to be difficult for enlarging heat-transfer surface and can't removing heat fast, formed the difficult problem of ice crystal as early as possible.

The 6th, to compare with various hot method sea water desaltinations, cold method is moved under worst cold case, and the corrosion and the scale problems of equipment comparatively relaxed, and can adopt the lower material of price, has reduced the initial cost and the working cost of equipment;

The 7th, the present invention is provided with special auxiliary cooling subsystem, this subsystem can guarantee that whole seawater desalination system starts operation smoothly, also can be behind the circulation certain hour, and the short period of time starts this auxiliary cooling system, in time replenish the loss of cold, guarantee that fresh water yield is constant.

Description of drawings:

Fig. 1 realizes first kind of workflow diagram of desalting process for the present invention.

Fig. 2 realizes second kind of workflow diagram of desalting process for the present invention.

Fig. 3 is the structural principle synoptic diagram of the high-order water tank that freezes.

Fig. 4 is the structural principle synoptic diagram of the icing water tank of low level.

Embodiment:

The heat pump circulating system that relates in the invention process, high-order icing water tank and low level freeze water tank for realizing the indispensable part of sea water desaltination, the major parts of its total system comprises: buffer memory water tank 1, buffer memory water tank drain valve 2, the high-order water tank wash spray device 3 that freezes, the high-order water tank wash spray control valve 4 that freezes, four-way valve 5, device for drying and filtering 6, the high-order water tank interchanger 7 that freezes, throttle expansion valve 8, device for drying and filtering 9, heat pump cycle compressor 10, throttle expansion valve 11, the high-order water tank brine discharge valve 12 that freezes, the high-order water tank product water discharging valve 13 that freezes, the high-order water tank 14 that freezes, auxiliary cooling system compressor 15, the auxiliary cooling system condenser (is selected air-cooled, heat is discharged in the atmosphere, or selection water-cooled, comprise modes such as adopting the direct cooling of seawater) 16, device for drying and filtering 17, the low level water tank wash spray device 18 that freezes, the low level water tank wash spray control valve 19 that freezes, the low level water tank brine discharge valve 20 that freezes, the low level water tank product water discharging valve 21 that freezes, the low level water tank interchanger 22 that freezes, the low level water tank 23 that freezes, charging seawater pipeline 24, charging seawater water pump 25, charging sea water cooler 26, strong brine discharge line 27, product water discharge pipe road 28, product water tank 29, washing water pump 30, the high-order water tank sea intake 31 that freezes, the high-order water tank top cover (thermal insulation layer is arranged) 32 that freezes, the high-order water tank wash spray pipe 33 that freezes, the heat pump circulating system interchanger takes over 34,35, the high-order water tank that freezes freezes and manages fin 36, the high-order water tank side plate (thermal insulation layer is arranged) 37 that freezes, the high-order water tank interchanger working medium tube 38 of freezing, interchanger strut member 39, high-order freeze water box plate (thermal insulation layer is arranged) 40, the high-order water tank salt solution relief outlet 41 that freezes, water shoot is installed downward-sloping direction 42, the high-order water tank product water relief outlet 43 that freezes, base plate is installed downward-sloping direction 44, the auxiliary cooling system interchanger takes over 45,46, washing water take over 47, the low level water tank sea intake 48 that freezes, the low level water tank top cover (thermal insulation layer is arranged) 49 that freezes, the low level water tank wash spray pipe 50 that freezes, the heat pump circulating system interchanger takes over 51,52, the low level water tank side plate (thermal insulation layer is arranged) 53 that freezes, the low level water tank pipe fin 54 that freezes that freezes, the low level water tank interchanger working medium tube 55 of freezing, interchanger strut member 56, low level freeze water box plate (thermal insulation layer is arranged) 57, the low level water tank salt solution relief outlet 58 that freezes, water shoot is installed downward-sloping direction 59, the low level water tank product water relief outlet 60 that freezes, base plate is installed downward-sloping direction 61, and washing water take over 62.

The seawater desalination system of the inventive method comprises that charging seawater subsystem, strong brine are carried and discharging subsystem, product water are carried and discharging subsystem, ice sheet wash subsystem, heat pump cycle subsystem, auxiliary cooling subsystem and seven parts of central control subsystem.The principle of work of each subsystem and effect are:

Charging seawater subsystem: the seawater through preliminary treatment is sent into system by sea water supply pump 25, at first passes through charging sea water cooler 26, absorbs the cold of fresh water, strong brine, enters buffer memory water tank 1 again; After treating that the high-order water tank drain valve 12,13 that freezes is closed, open the water discharge valve 2 of buffer tank, allow and cool off good charging seawater and enter in the high-order water tank 14 that freezes; Its effect is that the charging seawater is sent into the high-order water tank that freezes, and reclaims the strong brine of discharge system and the cold of fresh water simultaneously.

Strong brine conveying and discharging subsystem: the strong brine of the high-order water tank 14 that freezes is discharged into the icing water tank 23 of low level by strong brine outlet valve 12, forms a part of fresh water again by freezing; The low level strong brine that freezes yet in the water tank 23 that freezes is discharged into charging sea water cooler 26 by strong brine outlet valve 20, cold is passed to the charging seawater after, discharge from strong brine relief outlet 27; Its effect is that the strong brine of two icing water tanks is discharged smoothly, and the cold of the strong brine that the water tank 23 that simultaneously low level frozen is discharged passes to the charging seawater, realizes the recovery of cold.

Product water is carried and the discharging subsystem: the freeze product water of water tank 23 of high-order freeze water tank 14 and low level all pass through separately product water outlet valve 13 or 21, inflow charging sea water cooler 26, cold passed to the charging seawater after, enter product water tank 29; Its effect is that the product water of two icing water tanks is delivered to the product water tank smoothly, simultaneously its cold is passed to the charging seawater, realizes the recovery of cold.

Ice sheet washing subsystem: the fresh water of product water tank 29 is sent into respectively in high-order freeze water tank 14 or the icing water tank 23 of low level by washing subsystem controls valve 4 or 19 after washing water pump 30 boosts, and by sprinkling system fresh water is sprayed onto the ice sheet surface equably; Its effect is to wash the seawater on surface off, and the fresh water quality is further improved.

Heat pump cycle subsystem:, two kinds of different Recycle design are arranged by changing the direction of four-way valve 5.In a high position is frozen water tank 14 is seawater, when being ice sheet in the icing water tank 23 of low level, move by the mode shown in second kind of workflow diagram, interchanger 7 in the high-order water tank 14 that freezes is a vaporizer, the interchanger 22 of the icing water tank 23 of low level is a condenser, after compressor 10 starts, the heat pump fluid of interchanger 7 absorbs heat from a high position is frozen water tank in the high-order water tank 14 that freezes, heat pump fluid changes gaseous state into by liquid state when making seawater icing, enter from the suction side of compressor 10, behind compressed machine 10 pressurize, be sent in the condensing heat exchanger 22 of the icing water tank 23 of low level, in freezing water tank 23, low level emits heat, heat pump fluid changed liquid state into by gaseous state when ice sheet was melted, under the high pressure effect, and liquid refrigerant flow through device for drying and filtering 17 and throttle expansion valve 11, enter once more in the interchanger 7 of the high-order water tank 14 that freezes, form the heat pump cycle process; In low level freezes water tank 23 is seawater, when being ice sheet in the high-order water tank 14 that freezes, move by the mode shown in first kind of workflow diagram, interchanger 22 in the icing water tank 23 of low level are vaporizer, interchanger 7 in the high-order water tank 14 that freezes is a condenser, after compressor 10 starts, heat pump fluid in the interchanger 22 in the icing water tank 23 of low level absorbs heat from the seawater of the icing water tank of low level, heat pump fluid changes gaseous state into by liquid state when making seawater icing, enter from the suction side of compressor 10, behind compressed machine 10 pressurize, be sent in the interchanger 7 of the high-order water tank 14 that freezes, in freezing water tank, a high position emits heat, heat pump fluid changed liquid state into by gaseous state when ice sheet was melted, under the high pressure effect, and liquid refrigerant flow through device for drying and filtering 6 and throttle expansion valve 11, enter once more in the interchanger 22 of the icing water tank 23 of low level, form another heat pump cycle process.The effect of this subsystem is: the vaporizer by heat pump is realized seawater icing-removal salinity, utilize its condenser to realize the thawing-formation fresh water of ice sheet simultaneously, utilize the commutation effect of four-way valve again, the high-order desalting process that freezes water tank and the icing water tank of low level is combined, realize energy-efficient desalting process.

The auxiliary cooling subsystem: the high-order interchanger 7 that freezes water tank 14 is the vaporizer of this refrigeration subsystem, when the icing water tank of a high position carries out freezing process, can start the auxiliary cooling subsystem, liquid refrigeration working medium in the interchanger 7 in the high-order water tank 14 that freezes is absorbed heat from seawater, refrigeration working medium changes gas into by liquid state when making seawater icing, enter from the suction side of compressor 15, behind compressed machine 15 pressurize, be sent in the condensing heat exchanger 16 of auxiliary cooling subsystem, change liquid state into by gaseous state after emitting heat, under the high pressure effect, liquid refrigerant flow through device for drying and filtering 9 and throttle expansion valve 8, enter once more in the interchanger 7 of the high-order water tank 14 that freezes, form the refrigeration cycle process.The effect of this subsystem is: when starting in system, use this system to form primary ice sheet in a high position is frozen water tank, the desalting process of heat pump cycle subsystem is begun; In addition, behind heat pump cycle subsystem work certain hour, also need to make the work of auxiliary cooling subsystem short period of time,, make the sea water desaltination amount basicly stable with the cold of replenish loss.

Central authorities' control subsystem: comprise the startup and shutdown control of auxiliary cooling subsystem, the four-way valve 5 directions control of heat pump cycle subsystem and startup and shutdown control, the water pump 30 of ice sheet washing subsystem and the open and close control of valve 4,19, product water is carried with the valve control of discharging subsystem and with the interlock of charging water pump and is controlled, strong brine is carried with the valve control of discharging subsystem and with the interlock of charging water pump and is controlled the parts such as flooding quantity control of charging seawater subsystem.The effect of this subsystem is: make each subsystem or step organic assembling in chronological order, control the vaporization temperature of heat pump circulating system and auxiliary cooling system simultaneously, guarantee that desalting process carries out smoothly.

Embodiment 1: a kind of system and device of realizing the inventive method comprises the heat pump cycle subsystem that is made of the interchanger 22 in the icing water tank 23 of interchanger 7, four-way valve 5, compressor 10, low levels in the icing water tank 14 of a high position, device for drying and filtering 17,6, throttle expansion valve 11 etc.; By the high position auxiliary cooling subsystem that interchanger 7 in the water tank 14, compressor 15, condenser 16, device for drying and filtering 9, throttle expansion valve 8 etc. constitute that freezes; The charging seawater subsystem that constitutes by charging water pump 25, charging sea water cooler 26, buffer memory water tank 1, water discharge valve 2 and relevant connection pipeline; Carry and the discharging subsystem by the strong brine that strong brine outlet valve 12,20, charging sea water cooler 26 and the relevant connection pipeline of the icing water tank in high and low position constitutes; Carry and the discharging subsystem by the product water that product water outlet valve 13,21, charging sea water cooler 26, product water tank 29 and the relevant connection pipeline of the icing water tank in high and low position constitutes; The ice sheet that is made of water pump 30, control valve 4,19, spray thrower 3,18 and relevant connection pipeline washs subsystem; Central authorities' control subsystem is communicated with control with above-mentioned six subsystems by sea water desaltination principle aqueous vapor, realizes sea water desaltination.

The startup and the operational process of this system and device are as follows:

Earlier energy-efficient artificial cooling sea water desalinating plant is installed; By sea water supply pump 25, seawater is added in the high-order water tank 14 that freezes; Start the auxiliary cooling subsystem, make the seawater in the high-order water tank 14 that freezes on its heat-transfer surface, form ice sheet, after treating that ice sheet reaches certain thickness, close the auxiliary cooling subsystem, open the seawater bleed valve 12 of the high-order water tank that freezes, allow icing seawater flow into the icing water tank 23 of low level automatically from the icing water tank 14 of a high position by action of gravity; After treating that seawater has flowed, open the control valve 4 and the water pump 30 of ice sheet washing subsystem, the seawater flushing on ice sheet surface is clean by sprinkling system 3 with fresh water, behind the flushing certain hour, close ice sheet washing subsystem; After treating that wash-down water all flows out the high-order water tank 14 that freezes, close the strong brine bleed valve 12 on the connecting leg, start the heat pump cycle subsystem, this system moves by the mode shown in first kind of workflow diagram, absorb heat the seawater of heat pump fluid in the icing water tank 23 of low level, make it form ice sheet, simultaneously the heat that obtains is delivered to the interchanger 7 in the high-order icing water tank 14, ice sheet in the high-order water tank 14 that freezes is melted, form fresh water; After all ice sheets all melt, close the heat pump cycle subsystem, open the fresh water valve 13 of the high-order water tank that freezes, the strong brine bleed valve 20 and the charging seawater water pump 25 of the icing water tank of low level simultaneously, product water and the strong brine charging sea water cooler 26 of flowing through, after emitting cold, product water enters product water tank 29, and strong brine is discharged system, and the charging seawater that is cooled enters in the buffer memory water tank 1; After treating to freeze low level the seawater of water tank flow, open the control valve 19 and the water pump 30 of ice sheet washing subsystem, the seawater flushing on ice sheet surface is clean by spray thrower 18 with fresh water, wash certain hour after, close ice sheet and wash subsystem; Treat that wash-down water flows out all that low level freezes that water tank 23, the discharging of product water finish, after the seawater of buffer memory water tank 1 reaches water level and requires, fresh water valve 13, the low level of closing the high-order water tank 14 that the freezes seawater bleed valve 20 and the charging seawater water pump 25 of water tank 23 that freeze; Then, open the water discharge valve 2 of buffer tank, the charging seawater that is cooled is put into the high-order water tank 14 that freezes, then, allow the four-way valve 5 of heat pump cycle subsystem change direction, start the heat pump cycle subsystem once more, this system moves by the mode shown in second kind of workflow diagram, interchanger 7 in the high-order water tank 14 that freezes changes the vaporizer of this heat pump into, absorbs heat the seawater in the icing water tank 14 of a high position, forms new ice sheet, simultaneously, interchanger 22 in the icing water tank 23 of low level with the ice sheet in the icing water tank 23 of heat transferred low level, makes it melt generation fresh water as the condenser of heat pump; After the ice sheet of the icing water tank 23 of low level all melts, close the heat pump cycle subsystem, open the fresh water bleed valve 21 and the charging seawater water pump 25 of the icing water tank 23 of low level, allow fresh water enter charging sea water cooler 26, flow in the fresh water water tank 29 after cold being offered the seawater that newly advances from the low level water tank 23 that freezes; After the fresh water of the icing water tank 23 of low level all flows out, close fresh water bleed valve 21 and charging seawater water pump 25, open the seawater bleed valve 12 of the high-order water tank 14 that freezes, allow the seawater that freezes in the high-order water tank 14 that freezes flow into low levels automatically and freeze the water tank 23 from the high position water tank 14 that freezes by action of gravity; After treating that seawater has flowed, open the control valve 4 and the water pump 30 of ice sheet washing subsystem, the seawater flushing on ice sheet surface is clean by spray thrower 3 with fresh water, behind the flushing certain hour, close ice sheet washing subsystem; After treating that wash-down water all flows out the high-order water tank 14 that freezes, close the strong brine bleed valve 12 on the connecting leg, with 5 commutations of heat pump cycle subsystem four-way valve, open compressor 10, this system moves by the mode shown in first kind of workflow diagram, absorbs heat from the seawater that flow into the icing water tank 23 of low level, make it form ice sheet, simultaneously the heat that obtains is delivered to the interchanger of the high-order water tank 14 that freezes, the ice sheet of the high-order water tank 14 that freezes is melted, form fresh water; So move in circles, constantly produce fresh water.

Embodiment 1 adopts vertical decoration form, and the present invention is as long as install corresponding water pump additional in the position of partial discharge water, can the horizontal arrangement form of whole horizontally disposed formation, or the vertical layout of part, the horizontal layout of part and constitute the mixed-arrangement form.

Claims (7)

1. method for desalting seawater, the heat pump energy-conserving technology is applied to artificial indirect refrigeration seawater desalination system, it is characterized in that charging seawater, strong brine conveying are communicated with the system and device that is communicated with formation realization sea water desaltination again with two icing water tank aqueous vapors with discharging, the conveying of product water with discharging, ice sheet washing, heat pump cycle, auxiliary cooling and seven subsystems of central authorities' control according to sea water desaltination principle aqueous vapor; Two icing water tanks are arranged up and down, constitute high-order water tank and the icing water tank of low level of freezing, the vaporizer of closed heat pump circulating system and condenser are placed on respectively in two icing water tanks, the vaporizer of auxiliary cooling subsystem is an interchanger with high-order interchanger organic assembling of freezing water tank, forms the system of continuous output fresh water according to the operation operation reciprocation cycle of setting; Earlier seawater is added the high-order water tank that freezes, open the auxiliary cooling subsystem, vaporizer by this system forms ice sheet with the seawater in the icing water tank of a high position, after treating that ice sheet reaches thickness, close the auxiliary cooling subsystem, open the seawater bleed valve of elevated tank, allow the seawater that does not freeze flow into the icing water tank of low level automatically from the icing water tank of a high position by action of gravity; After treating that seawater has flowed, start ice sheet washing subsystem, with the seawater flushing of fresh water with the ice sheet surface, after treating that wash-down water all flows out the high-order water tank that freezes, close the brine discharge valve of the high-order water tank that freezes, start the heat pump cycle subsystem, this system will absorb heat and form ice sheet from the seawater that flow into the icing water tank of low level, simultaneously the heat that obtains is delivered to the interchanger of elevated tank, the ice sheet of the high-order water tank that freezes is melted, form fresh water; After ice sheet melts, close the heat pump cycle subsystem, open the fresh water valve of the high-order water tank that freezes, the seawater bleed valve and the charging seawater water pump of the icing water tank of low level simultaneously, fresh water and the strong brine charging sea water cooler of flowing through, after emitting cold, fresh water enters the fresh water water tank, and strong brine is discharged system, and the charging seawater that is cooled enters in the buffer memory case; After treating to freeze low level the seawater of water tank having flowed, start ice sheet washing subsystem, with fresh water that the seawater flushing on ice sheet surface is clean, treat that wash-down water flows out all that low level freezes that water tank, fresh water discharging finish, after the seawater of buffer memory water tank reaches water level, fresh water valve, the low level of closing the high-order water tank that the freezes seawater bleed valve and the charging seawater water pump of water tank that freeze; Then, open the water discharge valve of baffle-box, the charging seawater that is cooled is charged into the high-order water tank that freezes, then, allow the four-way valve of heat pump cycle subsystem change direction, start the heat pump cycle subsystem once more, interchanger in the high-order water tank that freezes changes the vaporizer of this heat pump into, from the seawater of the icing water tank of a high position, absorb heat, form new ice sheet, simultaneously, the interchanger in the icing water tank of low level is as the condenser of heat pump, with the ice sheet of the icing water tank of heat transferred low level, it is melted produce fresh water; After the ice sheet of the icing water tank of low level melts, close the heat pump cycle subsystem, open low level freeze the fresh water discharge solenoid valve and the charging seawater water pump of water tank, allow fresh water enter the charging sea water cooler, flow in the fresh water water tank after cold being offered the seawater that newly advances from the low level water tank that freezes; After the whole outflows of the fresh water of the icing water tank of low level, close fresh water discharge solenoid valve and charging seawater water pump, open the seawater bleed valve of the icing water tank of a high position, allow icing seawater lean on action of gravity to flow into the icing water tank of low level automatically from the icing water tank of a high position; After treating that seawater has flowed, start ice sheet washing subsystem, with the seawater flushing of fresh water with the icing water tank ice sheet surface of a high position, after treating that wash-down water all flows out the high-order water tank that freezes, close the brine discharge valve of the icing water tank of low level, allow the four-way valve of heat pump cycle subsystem change direction, start the heat pump cycle subsystem and from the seawater of the icing water tank of low level, absorb heat, make it form ice sheet, simultaneously the heat that obtains is delivered to the interchanger of the high-order water tank that freezes, the ice sheet of the high-order water tank that freezes is melted, form fresh water; So move in circles, constantly produce fresh water.
2. a kind of method for desalting seawater according to claim 1, it is characterized in that vaporizer, condenser and the artificial indirect refrigeration seawater desalination system of closed heat pump circulating system are organically combined, by the exchange function of four-way valve realization vaporizer and condenser, realize removing ice crystal and reclaiming cold from heat exchanger surface.
3. a kind of method for desalting seawater according to claim 1, it is characterized in that adopting strong brine, product water discharging energy recovery, by strong brine, product water and the heat exchange of charging seawater organic assembling that the icing water tank in high and low position is discharged, seawater temperature is supplied with in realization energy recovery and reduction.
4. a kind of method for desalting seawater according to claim 1 is characterized in that being separately installed with in two icing water tanks the needed with ribbing interchanger of freezing process, to enlarge effective heat exchange area or icing area.
5. the heat pump cycle in a kind of method for desalting seawater according to claim 1, the vaporizer that it is characterized in that the auxiliary cooling subsystem and icing water tank is with the shared identical hot fin organic composition one of interchanger, and its condenser is air-cooled or water-cooled.
6. a kind of method for desalting seawater according to claim 1 is characterized in that installing corresponding water pump additional in the position of partial discharge water, the horizontal arrangement form of whole horizontally disposed formation, or the vertical layout of part, the horizontal layout of part and constitute the mixed-arrangement form.
7. a kind of method for desalting seawater according to claim 1 is characterized in that charging seawater subsystem sends the charging seawater into the high-order water tank that freezes, and reclaims the strong brine of discharge system and the cold of fresh water simultaneously; Strong brine is carried with the discharging subsystem strong brine of two icing water tanks is discharged, and the cold of the strong brine that the water tank that simultaneously low level frozen is discharged passes to the charging seawater, realizes the recovery of cold; Product water is carried with the discharging subsystem product water of two icing water tanks is delivered to the product water tank, simultaneously its cold is passed to the charging seawater, realizes the recovery of cold; Ice sheet washing subsystem is washed the seawater on surface off, and the fresh water quality is further improved; The heat pump cycle subsystem is realized seawater icing removal salinity by the vaporizer of heat pump, utilize its condenser to realize that the thawing of ice sheet forms fresh water simultaneously, utilize the commutation effect of four-way valve again, the high-order desalting process that freezes water tank and the icing water tank of low level is combined, realize energy-efficient desalting process; The auxiliary cooling subsystem forms primary ice sheet in a high position is frozen water tank, the desalting process of heat pump cycle subsystem is begun, and after the heat pump cycle subsystem work, make the auxiliary cooling subsystem work, with the cold of replenish loss, make the sea water desaltination amount stable; Central authorities' control subsystem makes each subsystem or step organic assembling in chronological order, controls the vaporization temperature of heat pump circulating system and auxiliary cooling system simultaneously.
CNB2006100440986A 2006-05-09 2006-05-09 Sea water desalting method CN100374377C (en)

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Families Citing this family (9)

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Publication number Priority date Publication date Assignee Title
CN101671059B (en) * 2009-10-06 2011-03-30 冯静 Method and device structure for preparing ice and desalinating seawater by vehicles and natural energy resources
CN101671058B (en) * 2009-10-06 2011-01-26 冯静 Semi-automatic production method and equipment for preparing ice and desalinating seawater by natural energy resources
CN102452693B (en) * 2011-03-17 2015-02-25 杜文娟 Facility for desalting seawater with ice preparation by using beach, tide and cold
CN102173476B (en) * 2011-03-17 2012-07-04 杜文娟 Method for making ice and desalinating sea water by using beach, tide and cold
CN102464104B (en) * 2011-06-17 2015-08-05 冯静 Afloat solar energy sea water desalination apparatus is set
CN102320673B (en) * 2011-06-17 2012-10-10 冯静 Method for seawater desalination by utilizing solar energy, natural cold and sea surface
WO2013188450A1 (en) * 2012-06-11 2013-12-19 Great Salt Lake Minerals Corporation Methods for sustainable membrane distillation concentration of hyper saline streams
CN102838181A (en) * 2012-09-19 2012-12-26 罗良宜 Cold-heat combined supplying device for seawater desalination
EA201600256A3 (en) * 2015-10-22 2017-05-31 Игорь Владимирович Добровольский Energy-efficient installation on water treatment from salts and impurities by the "symmetrical freezing and water defrosting" method

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4467621A (en) * 1982-09-22 1984-08-28 Brien Paul R O Fluid/vacuum chamber to remove heat and heat vapor from a refrigerant fluid
EP0127166A2 (en) * 1983-05-31 1984-12-05 Yan Po Dr. Chang Limitless and limited heat sources power plants
US4827728A (en) * 1986-11-24 1989-05-09 Martin Marietta Energy Systems, Inc. Seven-effect absorption refrigeration
CN1194901C (en) * 2003-05-16 2005-03-30 上海交通大学 Double stage absorptive compressing type high temperature heat pump sea water desalination device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4467621A (en) * 1982-09-22 1984-08-28 Brien Paul R O Fluid/vacuum chamber to remove heat and heat vapor from a refrigerant fluid
EP0127166A2 (en) * 1983-05-31 1984-12-05 Yan Po Dr. Chang Limitless and limited heat sources power plants
US4827728A (en) * 1986-11-24 1989-05-09 Martin Marietta Energy Systems, Inc. Seven-effect absorption refrigeration
CN1194901C (en) * 2003-05-16 2005-03-30 上海交通大学 Double stage absorptive compressing type high temperature heat pump sea water desalination device

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
热泵干燥装置的结构及应用特性分析. 许树学,陈东,乔木.化工装备技术,第26卷第2期. 2005 *

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