CN104528850B - Based on concentrated fresh water sea salt heat energy three co-generation systems of the sea water desalinization strong brine degree of depth - Google Patents

Abstract

Based on concentrated fresh water sea salt heat energy three co-generation systems of the sea water desalinization strong brine degree of depth, relate to strong brine processing. Provide a kind of efficient, energy-conservation, compact conformation, good economy performance based on concentrated fresh water sea salt heat energy three co-generation systems of the sea water desalinization strong brine degree of depth. Be provided with the concentrated subsystem of the degree of depth, salt manufacturing subsystem, regeneration of waste liquor subsystem, condensation subsystem; The concentrated subsystem of the described degree of depth is provided with at least 1 grade of evaporation-absorber, evaporation-absorber is provided with vaporization chamber, absorption chamber, liquid barrier, heat exchange of heat pipe, strong brine shower, evaporation-absorber lithium-bromide solution shower, described salt manufacturing subsystem is provided with crystallization-absorber, separator, drier, crystallization-absorber is provided with crystallisation chamber, absorption chamber, liquid barrier, described regeneration of waste liquor subsystem is provided with generator, solution heat exchanger, aerial cooler, and described condensation subsystem is provided with brine preheater and condenser.

Description

Based on concentrated fresh water sea salt heat energy three co-generation systems of the sea water desalinization strong brine degree of depth

Technical field

The present invention relates to strong brine processing, particularly relate to a kind of based on the concentrated fresh water sea salt heat energy of the sea water desalinization strong brine degree of depthThree co-generation systems.

Background technology

As the effective way that solves shortage of fresh water problem, the importance of desalination technology highlights day by day, and it develops also more and moreRapidly. Current global desalination water total capacity has exceeded 7,000 ten thousand ton per days. The fresh-water recovery rate of existing desalination technology is conventionally lowIn 50%, mean that desalinization, producing in a large amount of fresh water, can discharge the strong brine that quantity is larger, its concentration and temperatureAll higher than seawater, and contain chemical agent and corrosion product, directly arrange sea and can cause marine pollution, and then destroy marine ecology.Along with the further expansion of desalinization scale, this problem can become increasingly conspicuous. Strong brine problem, as do not properly not settled, very canCan be able to become the key factor of restriction desalinization development.

Existing document is retrieved to discovery, and about the disposal and utilization of sea water desalinization strong brine, people have proposed kinds of schemes,Typically there is strong brine to ted salt manufacturing, electrodialysis salt manufacturing, film distillation salt manufacturing, strong brine or bittern and extract chemicals, strong brine tooYang Chi etc.; There is multinomial Chinese patent relevant therewith, for example: Alexandria Lei Busefu etc. " obtain the side of lithium chloride from saline solutionMethod and implement the equipment of the method " (ZL01823738), Feng Houjun etc. " process of seawater preparing potassium dihydrogen phosphate "(ZL200310117852), " the sewater desalination combined production process method of comprehensive utilization high benefit zero-emission " of Ge Wenyu(ZL200610151976), " processing the method from the raw material salt solution of desalter " of Ao Lifoyakebu etc.(ZL201280011383). The strong brine that above-mentioned patent proposes utilizes scheme mainly around salt manufacturing (producing fresh water) simultaneously with carryGet chemicals, this is the advantage place of sea water desalinization strong brine just also.

The current sea water desalinization strong brine overwhelming majority takes directly to arrange sea or the extra large method of the rear row of dilution, this one side and people's environmental protectionIt is relevant that consciousness is not enough, on the other hand also with lack efficient, ripe strong brine and utilize technology to have direct relation: strong brine teds systemSalt method floor space is large, the production cycle is long; Electroosmose process energy consumption is high, cost is high; Film way of distillation water flux is low, film cost is high.Therefore developing efficient, energy-conservation, strong brine comprehensive utilization technique good economy performance is the crucial class of desalinization industry sustainable developmentTopic.

Lithium-bromide solution has extremely strong absorbability to steam, has unique advantage in the strong brine degree of depth aspect concentrated and processing,This point does not also cause people's attention. Its advantage can be from following three aspect analyses:

1, utilize lithium-bromide solution to process strong brine, production efficiency is high, compact equipment. The absorbability body of lithium-bromide solutionNow the water vapour pressure of solution surface for example, far below the corresponding saturation pressure of solution temperature: temperature is that 40 DEG C, quality are denseDegree is 50% lithium-bromide solution, and water vapour pressure is 2.11kPa, far below 40 DEG C of corresponding steam-laden pressure 7.38kPa.This means, as long as water vapour pressure is higher than 2.11kPa, just can be absorbed by 40 DEG C, 50% lithium-bromide solution. Contrast therewith,Temperature is the saturated strong brine (taking NaCl solution as example, mass concentration is 26.8%) of 40 DEG C, and its water vapour pressure is 5.63kPa,Temperature is the saturated strong brine (mass concentration is 26.5%) of 30 DEG C, and its water vapour pressure is 3.18kPa. Visible, utilize brominationLithium solution-treated strong brine, steam pressure reduction is large, mass transfer force is large, thus production efficiency is high, compact conformation.

2, also can be found out by upper example, lithium-bromide solution can the much lower steam of its temperature of absorptance, that is in absorption process,The comparable strong brine temperature of temperature of lithium-bromide solution is high a lot, and this absorbs heat and it is provided for salt water vaporization for reclaiming solutionVery favorable condition. This backheat is impossible realize in conventional system, but due to the characteristic of lithium-bromide solution, makes itBecome possibility.

3, during taking lithium-bromide solution as working medium, very conveniently combine with absorption heat pump, thereby greatly improve capacity usage ratio.

From above analysis, lithium-bromide solution, there being outstanding advantage aspect strong brine processing, sets out thus, is expected to obtaining propertyStrong brine utilization system that can be good.

Summary of the invention

The present invention aims to provide the concentrated based on the sea water desalinization strong brine degree of depth of a kind of efficient, energy-conservation, compact conformation, good economy performanceFresh water sea salt heat energy three co-generation systems.

The present invention is provided with the concentrated subsystem of the degree of depth, salt manufacturing subsystem, regeneration of waste liquor subsystem, condensation subsystem;

The concentrated subsystem of the described degree of depth is provided with at least 1 grade of evaporation-absorber, for by saturated the strong brine simmer down to after desalinizationSalt solution, described evaporation-absorber be provided with vaporization chamber, absorption chamber, liquid barrier, heat exchange of heat pipe, strong brine shower, evaporation-Absorber lithium-bromide solution shower, vaporization chamber is for strong brine vaporization, and absorption chamber absorbs steam for lithium-bromide solution, gearLiquid plate is between vaporization chamber and the upper space of absorption chamber; The release end of heat of heat exchange of heat pipe is dipped in the strong brine of vaporization chamber, heatThe heat absorbing end of heat exchange of heat pipe is dipped in the lithium-bromide solution of absorption chamber; Strong brine shower is contained in vaporization chamber top; Evaporation-absorberLithium-bromide solution shower is contained in absorption chamber top;

Described salt manufacturing subsystem is provided with crystallization-absorber, separator, drier, and salt manufacturing subsystem is for concentrating subsystem from the degree of depthIn the saturated brine of discharging, produce solid sea salt; Described crystallization-absorber is provided with crystallisation chamber, absorption chamber, liquid barrier, and crystallisation chamber is usedIn saturated brine being vaporized to supersaturation and forming crystallization, absorption chamber absorbs steam for lithium-bromide solution; Liquid barrier is positioned at knotBetween brilliant chamber and the upper space of absorption chamber; Crystallization-absorber lithium-bromide solution shower, described separator are equipped with in absorption chamber topCarry out liquid-solid separation for the salt slurry to from crystallization-absorber, described drier is used for solid salt further dry, drierWith drying medium be the hot-air from regeneration of waste liquor subsystem;

Described regeneration of waste liquor subsystem is provided with generator, solution heat exchanger, aerial cooler, and regeneration of waste liquor subsystem is used for willThe bromize lithium dilute solution that the concentrated subsystem of the degree of depth is discharged concentrates and is regenerated as concentrated solution, reclaims recycling heat energy simultaneously, obtains hot-air;In generator, driving heat source heat dilute solution, obtains concentrated solution and steam; In solution heat exchanger, lithium bromide is rare moltenLiquid is heated, and concentrated solution is cooled; Aerial cooler is for reducing lithium-bromide solution temperature, and the heat energy of recovery is used for adding hot-air;

Described condensation subsystem is provided with brine preheater and condenser, and in brine preheater, part is from regeneration of waste liquor subsystemThe steam-condensation of generator, condensation heat is for preheating material strong brine, the condensation in condenser of remaining steam, emits heatCan, the condensed water that brine preheater and condenser are discharged is fresh water.

The present invention, taking the strong brine after desalinization as raw material, based on principle of absorption, produces fresh water, sea salt, heat energy simultaneously; ThisInvention comprises that the degree of depth concentrates subsystem, salt manufacturing subsystem, regeneration of waste liquor subsystem, condensation subsystem, comprises that salt solution is concentrated and tiesBrilliant process, solution moisture absorption and concentrated regenerative process, air heat and moisture absorption process, steam produce and condensation process; With seawaterStrong brine after desalination is raw material, taking the above steam of more than 100 DEG C hot water or 0.1MPa as driving heat source, additional a small amount of electric energy,Can output salt concentration lower than the high-quality fresh water of 0.003% (30ppm), moisture lower than 0.5% extra large salinity and temperature higher thanThe heat energy of 55 DEG C.

The present invention has the following advantages:

1, there is good economic performance: from equipment aspect, system is mainly made up of various heat exchangers and pump, utilizes conventional skillArt just can complete, and equipment cost is low; From operation aspect, system mainly consumes low grade heat energy, and energy consumption cost is low; From outputAspect sees, fresh water, sea salt, three kinds of products of heat energy are shared equipment cost and operating cost. If the consideration high concentration bittern that dischargesFurther utilize, economic benefit can be more remarkable.

2, utilize the strong absorption characteristic of lithium-bromide solution to steam, increase mass transfer force by rational flow scheme design simultaneously,Can realize efficient concentration and the rapid crystallization of strong brine, therefore compact conformation, production efficiency are high.

3, adopt interior backheating type evaporation-absorber to form absorption heat pump together with solution circulation, utilize air recovery section to absorbHeat, output device have the condensation heat of value, and the utilization of above measure makes native system have the energy more much higher than conventional systemUtilization rate.

4, fresh-water recovery rate is higher than 75%, and fresh water yield is large, and owing to adopting the way of distillation, fresh water water quality is good.

5, utilizing 100 DEG C of above hot water or steam more than 0.1MPa is driving heat source, additional a small amount of electric energy, Ji KeshiThe high-efficiency operation of existing system is the effective way of utilizing industrial exhaust heat and solar thermal energy.

6, be applicable to very much combining with low-temperature multi-effect evaporation seawater desalinization process: native system provides driving heat energy for low-temperature multi-effect system,Low-temperature multi-effect system is the native system strong brine of supplying raw materials; Also be applicable to normal-temperature operation or the freezing etc. such as counter-infiltration lower than environment temperatureThe seawater desalination system of degree operation combines: the heat energy of native system output can be preheating to proper temperature by strong brine, concentrates acceleratingSpeed.

Brief description of the drawings

Fig. 1 is the structure composition schematic diagram of the embodiment of the present invention.

Detailed description of the invention

Below in conjunction with the drawings and specific embodiments, the present invention is further illustrated.

As shown in Figure 1, the embodiment of the present invention comprises 4 subsystems: the degree of depth concentrates subsystem 1, salt manufacturing subsystem 2, solution againRaw subsystem 3, condensation subsystem 4.

The concentrated subsystem 1 of the described degree of depth comprises the 1st evaporation-absorber the 11, the 2nd evaporation-absorber 12 and brine pump 13, forBy the strong brine simmer down to concentration of salt concentration after desalinization approximately 7% higher than 26% saturated brine. Described the 1st evaporation-absorbDevice 11 is by 116 groups of vaporization chambers 111, absorption chamber 112, liquid barrier 113, heat exchange of heat pipe 114, shower 115, showerBecome. Vaporization chamber 111 is places of strong brine vaporization, and absorption chamber 112 is places that lithium-bromide solution absorbs steam. Liquid barrier113 between vaporization chamber 111 and the upper space of absorption chamber 112, makes steam flow to absorption chamber 112 from vaporization chamber 111,Avoid strong brine drop to splash into absorption chamber 112 simultaneously. The release end of heat of heat exchange of heat pipe 114 is dipped in the strong brine of vaporization chamber 111,Heat absorbing end is dipped in the lithium-bromide solution of absorption chamber 112, the heat of emitting for reclaiming absorption process, and by it for strong brineVaporization. Shower 115 is equipped with on vaporization chamber 111 tops, for atomization strong brine, accelerates its vaporization; Be equipped with on absorption chamber 112 topsShower 116, for atomization lithium-bromide solution, strengthening absorption process. The top of absorption chamber 112 is connected and (takes out with air extractorDevice of air does not illustrate in the drawings), to deflate or other incoagulable gas. Described the 2nd evaporation-absorber 12 and the 1st evaporation-absorber 11 structures are identical. Shown in Fig. 1 is secondary concentration process, can be as the case may be in practicality, increase, subtract concentratedThe progression of process.

Described salt manufacturing subsystem 2 comprises crystallization-absorber 21, separator 22, drier 23, pump 24, pump 25, pump 26,Produce solid sea salt for the saturated brine from the degree of depth is concentrated. Crystallization-absorber 21 by crystallisation chamber 211, absorption chamber 212,Liquid barrier 213 forms. Crystallisation chamber 211 is that saturated brine is vaporized to the place of supersaturation and then crystallization, and absorber 212 is brominesChange the place that lithium solution absorbs steam. Liquid barrier 213, between crystallisation chamber 211 and the upper space of absorption chamber 212, makesSteam can flow to absorption chamber 212 from crystallisation chamber 211, avoids strong brine drop to enter absorption chamber 212 simultaneously. On absorption chamber 212Shower 214 is equipped with in portion, for atomization lithium-bromide solution, and strengthening absorption process. The top of absorption chamber 212 and air extractor connectConnect, to get rid of incoagulable gas. Separator 22 carries out liquid, solid separation for the salt slurry to from crystallization-absorber 21, obtainsWater content, lower than 3% solid salt, is discharged bittern simultaneously. Drier 23, for further dry to solid salt, is finally containedThe water yield is lower than 0.5% sea salt product; Drying medium used is the hot-air from regeneration of waste liquor subsystem 3.

Described regeneration of waste liquor subsystem 3 comprises generator 31, solution heat exchanger 32, the 1st aerial cooler the 33, the 2nd airCooler 34, the 3rd aerial cooler 35, blower fan 36, pump 37, pump 38, pump 39, for arranging concentrated degree of depth subsystem 1The concentrated concentrated solution that is regenerated as of bromize lithium dilute solution going out, removal process heat energy, acquisition hot-air simultaneously. In generator 31, driveThermal source heat dilute solution, obtains concentrated solution and steam. Solution heat exchanger 32 is for heating bromize lithium dilute solution to reduce generator31 thermic load, cooling concentrated solution is to increase its absorbability simultaneously. The 1st aerial cooler the 33, the 2nd aerial cooler 34,The 3rd aerial cooler 35 all arranges for reducing lithium-bromide solution temperature and then increasing absorbability, and the heat energy of recovery is usedIn adding hot-air; Gained hot-air is as the drying medium of drier 23.

Described condensation subsystem 4 comprises brine preheater 41, condenser 42, pump 43, valve 44. Brine preheater 41 is in advanceHot charge strong brine, to improve the water vapour pressure in vaporization chamber 111, thereby increases mass transfer force. For reducing corrosion, pre-Hot temperature degree should be lower than 40 DEG C. Valve 44 is for regulating the steam flow that enters brine preheater 41; Remaining steam is in condensationCondensation in device 42, discharges the heat energy higher than 55 DEG C. The top of condenser 42 is connected with air extractor, to get rid of incoagulability gasBody. The condensed water that brine preheater 41 and condenser 42 are discharged is product fresh water.

Below in conjunction with Fig. 1, narrate of the present invention based on concentrated fresh water sea salt heat energy three co-generation systems of the sea water desalinization strong brine degree of depthSpecific works process.

1, salt solution concentrates and crystallization process. Raw material strong brine after preheating, sprays into steaming through shower 115 in brine preheater 41Send out chamber 111, a part of shwoot is steam, and remaining strong brine falls within vaporization chamber 111 bottoms, continues vaporization, concentrated. Lithium bromideSolution sprays into absorption chamber 112 through shower 116, absorbs after the part steam from vaporization chamber 111, falls within absorption chamber 112Bottom, continues moisture absorption, dilution. Heat exchange of heat pipe 114 passes to vaporization chamber by heat energy by the lithium-bromide solution in absorber 112Strong brine in 111. After salt solution after one-level is concentrated is pressurizeed by brine pump 13, enter vaporization chamber 121, concentrated through secondary,Obtain saturated brine. In crystallisation chamber 211 in crystallization-absorber 21, saturated brine continues vaporization and becomes supersaturated brine,Partially crystallizable afterwards, gained salt slurry through centrifugation, obtains solid salt and bittern in separator 22. Bittern is discharged, solid saltEnter drier 23, after heated air drying, become product sea salt.

2, solution moisture absorption and concentrated regenerative process. From the bromize lithium concentrated solution of generator 31 through solution pump 39 pressurize, the 3rd skyAfter Gas Cooler 35 coolings, spray in the absorption chamber 212 of crystallization-absorber 21, absorb the steam from crystallisation chamber 211,Solution temperature raises, concentration reduces; This solution pressurizes, after the 2nd aerial cooler 34 cooling, sprays into the 2nd through solution pump 26In the absorption chamber 122 of evaporation-absorber 12, absorb the steam from vaporization chamber 121, solution temperature raises, concentration enters oneStep reduces; This solution pressurizes, after the 1st aerial cooler 33 cooling, sprays into the 1st evaporation-absorber 11 through solution pump 38In absorption chamber 112, absorb the steam from vaporization chamber 111, solution temperature raises, concentration further reduces. Gained is rare moltenLiquid pressurizes, after solution heat exchanger 32 preheatings, enters generator 31 through solution pump 37, through driving heat source heating, is separated into water and steamsGas and concentrated solution.

3, air heat and moisture absorption process. Air from environment pressurizes through blower fan 36, then successively at the 1st aerial cooler33, in the 2nd aerial cooler the 34, the 3rd aerial cooler 35, heated by lithium-bromide solution, gained hot-air enters drier23, absorb after the moisture in sea salt, discharged to environment.

4, steam produces and condensation process. The moisture absorption of solution, regenerative process are in fact also the production processes of steam: at knotIn crystalline substance-absorber 21, the 2nd evaporation-absorber 12 and the 1st evaporation-absorber 11, the steam that salt water vaporization produces is by brominationLithium solution absorbs, and is vaporizated into again steam in generator 31. Steam condensation in brine preheater 41 and condenser 42Become fresh water.

Through said process, can obtain salt concentration lower than the high-quality fresh water of 0.003% (30ppm), moisture lower than 0.5%Extra large salinity and temperature higher than the heat energy of 55 DEG C, this heat energy can be used for driving low-temperature multiple-effect seawater desalination process or other thermal process. SeparatelyOutward, the bittern that system is discharged can be used as further extraction or produces the material liquid of chemicals. The present invention also can use for reference for removing seawaterThe advanced treating of other salt solution outside desalination strong brine.

The degree of depth that the present invention utilizes lithium-bromide solution to realize strong brine to the strong absorption characteristic of steam concentrates and crystallization. Arrange evaporation-Absorber, strong brine and lithium-bromide solution carry out heat, matter exchange therein, and lithium-bromide solution absorbs steam, strong brine partVaporization; Conventionally concentrated through secondary, just can be by the salt solution simmer down to salt concentration of salt concentration approximately 7% higher than 26% saturated saltWater. Crystallization-absorber is set, and by the absorption of lithium-bromide solution, making saturated brine continue vaporization becomes supersaturated brine,Produce afterwards sea salt crystal.

The present invention utilizes interior backheating type evaporation-absorber that the heat that partially absorbs of solution is vaporized for strong brine. At evaporation-absorberVaporization chamber and absorption chamber between heat exchange of heat pipe is set, the heat release section of heat exchanger is dipped in the strong brine of vaporization chamber, heat absorbing end is soakedIn the lithium-bromide solution of absorption chamber. In system when operation,, the lithium-bromide solution temperature in absorption chamber is higher than the strong brine in vaporization chamber,This is on the one hand relevant with the selection of design parameter, on the other hand also because: absorption process is exothermic process, can bromizate lithium solutionTemperature raises; Evaporation process is endothermic process, can make strong brine temperature reduce. The setting of interior backheating type heat exchange of heat pipe can reduceLithium-bromide solution temperature, increase its absorbability, heat strong brine simultaneously, accelerate its vaporization, concentration process.

The present invention adopts the arrangement of salt solution following current, solution adverse current, ensures the mass transfer force of concentrated and crystallization process. At thisInvent in described system first order evaporation-absorber, second level evaporation-absorber, the series connection of crystallization-absorber; Salt solution following current clothPut, enter successively first order evaporation-absorber, second level evaporation-absorber, crystallization-absorber; Lithium-bromide solution counter-flow arrangement,Being introduced into crystallization-absorber, is then second level evaporation-absorber, first order evaporation-absorber. Arrange like this it is according to couplingPrinciple: in first order evaporation-absorber, salt solution and concentration that salt concentration is lower, water vapour pressure is higher is lower, absorb energyThe weak lithium-bromide solution of power matches; In crystallization-absorber, salt solution and concentration that salt concentration is high, water vapour pressure is low is high,The lithium-bromide solution coupling that absorbability is strong; Can ensure that so each process has enough mass transfer forces.

The present invention utilizes the cooling lithium-bromide solution of air to increase the absorbability of solution, and gained hot-air is as dry Jie of sea saltMatter. Under same concentration, the temperature of lithium-bromide solution is lower, and its surface water steam pressure is lower, solution absorbability is stronger. CauseThis arranges aerial cooler in system, for the cooling lithium-bromide solution that enters evaporation-absorber and crystallization-absorber; GainedHot-air, for dry sea salt, in improving sea salt quality, is utilized system capacity more fully.

Claims (1)

1. based on concentrated fresh water sea salt heat energy three co-generation systems of the sea water desalinization strong brine degree of depth, it is characterized in that being provided with the degree of depth concentratedSubsystem, salt manufacturing subsystem, regeneration of waste liquor subsystem and condensation subsystem;

The concentrated subsystem of the described degree of depth is provided with at least 1 grade of evaporation-absorber, for by saturated the strong brine simmer down to after desalinizationSalt solution, described evaporation-absorber be provided with vaporization chamber, absorption chamber, liquid barrier, heat exchange of heat pipe, strong brine shower and evaporation-Absorber lithium-bromide solution shower, vaporization chamber is for strong brine vaporization, and absorption chamber absorbs steam for lithium-bromide solution, gearLiquid plate is between vaporization chamber and the upper space of absorption chamber; The release end of heat of heat exchange of heat pipe is dipped in the strong brine of vaporization chamber, heatThe heat absorbing end of heat exchange of heat pipe is dipped in the lithium-bromide solution of absorption chamber; Strong brine shower is contained in vaporization chamber top; Evaporation-absorberLithium-bromide solution shower is contained in absorption chamber top;

Described salt manufacturing subsystem is provided with crystallization-absorber, separator and drier, and salt manufacturing subsystem is for concentrating subsystem from the degree of depthIn the saturated brine of discharging, produce solid sea salt; Described crystallization-absorber is provided with crystallisation chamber, absorption chamber and liquid barrier, and crystallisation chamber is usedIn saturated brine being vaporized to supersaturation and forming crystallization, absorption chamber absorbs steam for lithium-bromide solution; Liquid barrier is positioned at knotBetween brilliant chamber and the upper space of absorption chamber; Crystallization-absorber lithium-bromide solution shower, described separator are equipped with in absorption chamber topCarry out liquid-solid separation for the salt slurry to from crystallization-absorber, described drier is used for solid salt further dry, drierWith drying medium be the hot-air from regeneration of waste liquor subsystem;

Described regeneration of waste liquor subsystem is provided with generator, solution heat exchanger and aerial cooler, and regeneration of waste liquor subsystem is used for willThe bromize lithium dilute solution that the concentrated subsystem of the degree of depth is discharged concentrates and is regenerated as concentrated solution, reclaims recycling heat energy simultaneously, obtains hot-air;In generator, driving heat source heat dilute solution, obtains concentrated solution and steam; In solution heat exchanger, lithium bromide is rare moltenLiquid is heated, and concentrated solution is cooled; Aerial cooler is for reducing lithium-bromide solution temperature, and the heat energy of recovery is used for adding hot-air;

Described condensation subsystem is provided with brine preheater and condenser, and in brine preheater, part is from regeneration of waste liquor subsystemThe steam-condensation of generator, condensation heat is for preheating material strong brine, the condensation in condenser of remaining steam, emits heatCan, the condensed water that brine preheater and condenser are discharged is fresh water.