CN104399267B - A kind of flash distillation wave steam recompression continuous evaporation system - Google Patents

A kind of flash distillation wave steam recompression continuous evaporation system Download PDF

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CN104399267B
CN104399267B CN201410710970.0A CN201410710970A CN104399267B CN 104399267 B CN104399267 B CN 104399267B CN 201410710970 A CN201410710970 A CN 201410710970A CN 104399267 B CN104399267 B CN 104399267B
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evaporator
flash distillation
steam
wave
effect
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CN104399267A (en
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代玉强
胡大鹏
张斯亮
朱彻
邹久朋
陶盛洋
程永航
张大为
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ACKAM (JIANGSU) INDUSTRIAL TECHNOLOGY Co.,Ltd.
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Dalian University of Technology
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Abstract

A kind of flash distillation wave steam recompression continuous evaporation system, belongs to hot method evaporation technique field.Core introduces flash distillation wave pressure supercharger, the supercharging performance of the flash distillation wave of saturation water with pressure is utilized to complete the recompression of flash distillation wave steam, realize the recompression of flash distillation wave steam and flash distillation complex supercharge/steam heat compression coupling two systems, end effect secondary steam enters in flash distillation wave pressure supercharger and completes recompression, after promoting energy taste, enter first evaporator as driving heat source, the indirect steam of generation, after gas-liquid separation module completes separation, continues evaporation as lower effect thermal source; Stoste after each single-effect evaporator concentrate to saturated concentration, by pumping out device.Present invention achieves the compression process compression of the gas phase of steam being converted into liquid phase pump, efficiency is significantly improved, and both can overcome vapour compression machine design, manufacture a difficult problem for difficulty, have again the advantage higher than steam jet ejector charging efficiency.

Description

A kind of flash distillation wave steam recompression continuous evaporation system
Technical field
The present invention relates to a kind of flash distillation wave steam recompression continuous evaporation system, belong to hot method evaporation technique field.
Background technology
High-salt wastewater discharges arbitrarily and brings immense pressure to ecological environment, has caused government and street levels extensive concern, in the urgent need to the high-salt wastewater treatment technology of economical and efficient.In the large mainstream technology of current desalination three, reverse osmosis membrane (RO) method, good economy performance, but there is the problems such as fouling membrane, production capacity are little; The hot law technology energy consumptions such as conventional multistage flash distillation (MSF) and multiple-effect evaporation (MED) technology high (as triple effect MED consumes about 0.4 ton of live steam/ton waste water), economy is poor, and industry even thinks that hot law technology is not the developing direction of saline treatment technology.But there is the outstanding advantages of stable operation, salt clearance very high (can reach 98%-99%) in hot method process brine waste, and waste water salinity is higher, and advantage is more outstanding.
As the hot method treatment technology of one, thermodynamic steam recompression (TVR), adopts steam ejector to recompress indirect steam, can partly utilize indirect steam latent heat, improve capacity usage ratio.This technological merit is that equipment is simple, without tumbler, energy-saving effect is better than traditional multiple-effect evaporation MED technology.But maximum problem is, and injector charging efficiency is low, and indirect steam latent heat is not fully utilized, and energy-saving effect is not remarkable.
Adopt wave rotor charging efficiency based on UNSTEADY FLOW process higher than the charging efficiency of steady flow process, this technology, without the need to the parts such as piston or blade, just efficiently can complete the DIRECT ENERGY exchange between high and low pressure fluid by means of only the Shock-Motion produced.CN101290174 provides a kind of outer circulation dissipation type air wave machine principle structure, and such both ends open wave rotor structure can complete the energy exchange of high-low pressure fluid.If the Shock-Motion this structure being used for saturated liquid flash distillation generation carries out the recompression of indirect steam, just form the main thought of this invention.
Summary of the invention
In order to overcome problems of the prior art, the invention provides the machine-processed continuous evaporation system of a kind of flash distillation wave steam recompression evaporation, the shock wave that its object is to make full use of the generation of flash distillation wave heats and pressurized effect, improves energy utilization efficiency.
The technical solution used in the present invention is:
A kind of flash distillation wave steam recompression continuous evaporation system, it comprises a multi-effect evaporator, heavy liquor pump, condensate pump, thermal source heat exchanger, multi-effect evaporator is made up of first evaporator, several single-effect evaporators and last evaporator, it also comprises flash distillation wave pressure supercharger, booster pump and a vavuum pump, the bottom of adjacent each single-effect evaporator adopts communicating pipe to connect, and also adopts the circulating pump of each single-effect evaporator to connect liquid uniform device in this single-effect evaporator; Outlet connects the driving heat source entrance of flash distillation wave pressure supercharger for thermal source heat exchanger that is saturated or overheated aqueous water and regulates the first control valve of flash distillation wave turbocharger inlet temperature, the head that the pressurized outlet of flash distillation wave pressure supercharger connects in first evaporator imitates heat exchanger, and the upper space of last evaporator adopts pipeline to connect the low-pressure steam inlet of flash distillation wave pressure supercharger; Described first evaporator upper space connects the secondary effect heat exchanger in time single-effect evaporator by pipeline, by that analogy, prime time single-effect evaporator upper space connects the secondary effect heat exchanger in rear class time single-effect evaporator by pipeline, and final stage time single-effect evaporator upper space connects the end effect heat exchanger in last evaporator by pipeline; Stoste enters from the stoste import of the condenser being positioned at last evaporator upper space, enters in first evaporator through stoste pipe, and the bottom of last evaporator connects heavy liquor pump, is provided with solidifying water connects dish in the bottom of condenser; The upper space of described last evaporator adopts pipeline to connect vavuum pump through steam-water separator; In described each single-effect evaporator, the outlet of each effect heat exchanger connects with solidifying water the water inlet coiling and be jointly connected booster pump and condensate pump, and booster pump connects thermal source heat exchanger through regulating the second control valve of flash distillation wave booster inlet pressure.
The upper space of described last evaporator adopts pipeline to be connected to the low-pressure steam inlet of steam jet ejector, and the pressurized outlet of steam jet ejector connects the low-pressure steam inlet of flash distillation wave pressure supercharger, drives steam to enter from the high pressure entry of steam jet ejector.
In technique scheme, described each single-effect evaporator refers to: first evaporator, several single-effect evaporators and last evaporator; The circulating pump of described each single-effect evaporator refers to: first effect circulating pump, several effect circulating pumps and end effect circulating pump; Liquid uniform device in this single-effect evaporator refers to: first effect liquid uniform device, several effect liquid uniform devices and end effect liquid uniform device.
The motion that technique scheme utilizes high pressure flash distillation that is saturated or overheated aqueous water to produce swashs supercharging performance, constructs a kind of novel flash distillation wave steam recompression mechanism (FEWVR, FlashingEvaporationWaveVaporRecompression).In realized system, utilize flash distillation wave pressure supercharger, the gas phase pressurization of water vapour is converted into the liquid phase pressurization of saturation water, the process efficiency of liquid booster pump is far above the charging efficiency of gas compressor.Wherein, the driving heat source of flash distillation supercharging wave rotor is industrial waste heat (hot water or steam), and be end effect evaporation indirect steam by purging stream, supercharging and overheated rear re-using latent heat, reach energy-conservation object.
The Automated condtrol scheme of technique scheme, inlet pressure and the temperature that should control flash distillation wave pressure supercharger keep stable, and all the other control programs there is no particular/special requirement and restriction.
According to the actual state of material liquid evaporating temperature, the recompression ratio of indirect steam has dividing of height, can have and adopt thermodynamic steam compression+flash distillation wave both vapor compression coupling technique and flash distillation wave steam recompression technique two kinds of implementation methods.For the situation that indirect steam pressure ratio is lower, only adopt flash distillation complex supercharge to complete, namely adopt FEWVR technique.For low-temperature evaporation situation, vacuum is high, and supercharging pressure ratio is high, and flash distillation wave rotor unsteady flo w can be adopted to compress the hybrid technique of FEW+ low-pressure ratio thermodynamic steam compression TVR, i.e. FEW/TVR technique.
The invention has the beneficial effects as follows: the flash distillation wave steam recompression FEWVR technology that this flash distillation wave steam recompression continuous evaporation system proposes, compare existing machinery steam recompression MVR and thermodynamic steam recompression TVR technology, there is following technical advantage:
The first, relative to function of mechanical steam recompression MVR technology, flash distillation wave recompression FEWR technology is without an equipment development difficult problem, and thermodynamic advantages is gas phase pressurization to be converted into liquid phase pressurization, and process efficiency improves.
The second, relative to thermodynamic steam recompression TVR technology, the advantage of flash distillation wave recompression FEWR technology is the efficiency of charging efficiency far above steam jet ejector.Steam jet ejector can only complete an expansion process, drives the latent heat utilization rate of steam low.
Three, for without steam occasion, thermodynamic steam recompression TVR technology uses limited, but the driving heat source of flash distillation wave recompression FEWR can be industrial waste heat, or even solar energy or geothermal energy, and the scope of application is wider.4th, flash distillation wave recompression also possesses outstanding band liquid operating characteristics, and equipment development advantage is that physical dimension is little, rotating speed is low, is easy to exploitation.
Accompanying drawing explanation
Fig. 1 is the continuous evaporation system diagram of a kind of liquid flashes wave recompression FEWVR.
Fig. 2 is that the recompression of a kind of flash distillation wave recompresses the continuous evaporation system diagram of the FEW/TVR that is combined with thermodynamic steam.
In figure: 1, vavuum pump, 2, steam-water separator, 3, last evaporator, 3a, end effect heat exchanger, 3b, end effect liquid uniform device, 4, condenser, 5, heavy liquor pump, 6, condensate pump, 7, end effect circulating pump, 7a, first effect circulating pump, 7b, secondary effect circulating pump, 8, secondary single-effect evaporator, 8a, secondary effect heat exchanger, 8b, secondary effect liquid uniform device, 9, first evaporator, 9a, first effect heat exchanger, 9b, first effect liquid uniform device, 10, booster pump, 11, thermal source heat exchanger, 12, first control valve, 13, flash distillation wave pressure supercharger, 14, stoste pipe, 15, second control valve, 16, communicating pipe, 17, steam jet ejector, WH, driving saturated liquid entrance, WL, low-pressure steam inlet, WM, flash distillation wave supercharger outlet, JH, injector drive steam inlet, JL, injector low-pressure steam inlet, JM, injector pressurized outlet.
Detailed description of the invention
Below in conjunction with embodiment and accompanying drawing, the present invention is described in more detail.
Embodiment 1 utilizes saturated or overheated aqueous water in flash distillation wave pressure supercharger, complete the recompression of indirect steam.
Fig. 1 shows a kind of flash distillation wave steam recompression continuous evaporation system.In figure, flash distillation wave steam recompression continuous evaporation system comprises a triple effect evaporator, heavy liquor pump 5, condensate pump 6, thermal source heat exchanger 11, triple effect evaporator is made up of first evaporator 9, secondary single-effect evaporator 8 and last evaporator 3, and first evaporator 9 adopts communicating pipe 16 to be connected to each other with time single-effect evaporator 8, secondary single-effect evaporator 8 with the bottom of last evaporator 3.The head adopting the head of first evaporator 9 to imitate in circulating pump 7a connection first evaporator 9 imitates liquid uniform device 9b, adopt time effect liquid uniform device 8b in the secondary effect circulating pump 7b connection time single-effect evaporator 8 of secondary single-effect evaporator 8, the end effect circulating pump 7 of employing last evaporator 3 connects the end effect liquid uniform device 3b in last evaporator 3.The outlet of thermal source heat exchanger 11 is saturated or overheated aqueous water, connect the driving heat source entrance WH of flash distillation wave pressure supercharger 13, the head that the pressurized outlet WM of flash distillation wave pressure supercharger 13 connects in first evaporator 9 imitates heat exchanger 9a, and the upper space of last evaporator 3 adopts pipeline to connect the low-pressure steam inlet WL of flash distillation wave pressure supercharger 13; Described first evaporator 9 upper space connects the secondary effect heat exchanger 8a in time single-effect evaporator 8 by pipeline, and secondary single-effect evaporator 8 upper space connects the end effect heat exchanger 3a in last evaporator 3 by pipeline; Stoste enters from the stoste import of the condenser 4 being positioned at last evaporator 3 upper space, enters in first evaporator 9 through stoste pipe 14, and the bottom of last evaporator 3 connects heavy liquor pump 5, is provided with solidifying water connects dish 18 in the bottom of condenser 4; The upper space of last evaporator 3 adopts pipeline to connect vavuum pump 1 through steam-water separator 2; First effect heat exchanger 9a, secondary effect heat exchanger 8a connect the common water inlet being connected booster pump 10 and condensate pump 6 of dish 18 with the outlet of end effect heat exchanger 3a with solidifying water, and booster pump 10 connects thermal source heat exchanger 11 through the second control valve 15.The inlet temperature of flash distillation wave pressure supercharger 13 and pressure remain stable respectively by the first control valve 12 and the second control valve 15, and pressure raising is completed by booster pump 10.
In each single-effect evaporator, evaporation side heat exchange adopts the liquid uniform device of forced circulation to complete liquid distribution.Following current and and flow in feeding manner, the feed liquid of front effect and aftereffect relies on pressure reduction to complete conveying; In adverse current feeding mode, forced circulation pump is relied on to complete feed liquid conveying.Flash distillation wave pressure supercharger 13 is three port flash distillation wave rotor boosters.
Flash distillation wave steam boosting (FEWVR) vapo(u)rization system is applied to the fields such as salt mine pretreatment, saline sewage process and desalinization.
Stoste enters in first evaporator 9 after entering condenser 4 preheating in last evaporator 3; Enter in flashed vapour ripple booster 13 after end effect secondary steam condensation portion steam, the supercharging mechanism of the unsteady flo w shock wave utilizing saturation water flash distillation to produce, stream stock heat content increases, enter first evaporator 9 as driving heat source, the indirect steam that first effect evaporation produces enters time single-effect evaporator 8 and serves as driving heat source, stoste after first effect evaporation utilizes pressure reduction to be delivered in time single-effect evaporator 8 to evaporate further, carries out, until original liquid concentration reaches technique needs or crystallization saturated concentration, being exported by heavy liquor pump 5 with this.
Evaporimeter respectively imitates the forced circulation unit of gas-liquid separation unit and the stoste that all can arrange indirect steam.Each effect stoste can adopt following current and stream and reflux type charging, and respectively between effect, stoste conveying is corresponding respectively utilizes the mode that pressure reduction natural flow is carried and forced circulation is carried.
Embodiment 2 combines the recompression utilizing and complete indirect steam in steam jet ejector and flash distillation wave pressure supercharger.
Fig. 2 shows the recompression of a kind of thermodynamic steam and recompresses with flash distillation wave steam the continuous evaporation system be combined.The difference of Fig. 2 and Fig. 1 is: the upper space of last evaporator 3 adopts pipeline to be connected to the low-pressure steam inlet JL of steam jet ejector 17, the pressurized outlet JM of steam jet ejector 17 connects the low-pressure steam inlet WL of flash distillation wave pressure supercharger 13, drives steam to enter from the high pressure entry JH of steam jet ejector 17.
In each single-effect evaporator, evaporation side heat exchange adopts the liquid uniform device of forced circulation to complete liquid distribution.Following current and and flow in feeding manner, the feed liquid of front effect and aftereffect relies on pressure reduction to complete conveying; In adverse current feeding mode, forced circulation pump is relied on to complete the conveying of stoste.Flash distillation wave pressure supercharger 13 is three port flash distillation wave rotor boosters, and steam jet ejector is that centre is entered to drive steam, and ring week enters low-pressure secondary steam.
The vapo(u)rization system that flash distillation wave steam boosting and thermodynamic steam recompression coupling (FEW/TVR) are formed is applied to the fields such as salt mine pretreatment, saline sewage process and desalinization.
Stoste enters in first evaporator 9 after entering condenser 4 preheating in last evaporator 3, enter steam jet ejector 17 after end effect secondary steam condensation portion steam (or not condensation) and carry out low-pressure ratio precommpression, the indirect steam that heat content increases enters in flash distillation wave pressure supercharger 13, the supercharging mechanism of the unsteady flo w shock wave utilizing saturated or overheated high-pressure liquid water to produce, stream stock heat content increases, enter first evaporator 9 as driving heat source, the indirect steam that first effect evaporation produces enters time single-effect evaporator 8 and serves as driving heat source, feed liquid after first effect evaporation utilizes pressure reduction to be delivered in time single-effect evaporator 8 to evaporate further, carry out until feed concentration reaches technique needs or crystallization saturated concentration with this, exported by heavy liquor pump 5.
Evaporimeter respectively imitates the forced circulation unit of gas-liquid separation unit and the stoste that all can arrange indirect steam.Each effect stoste can adopt following current and stream and reflux type charging, and respectively between effect, feed liquid conveying is corresponding respectively utilizes the mode that pressure reduction natural flow is carried and forced circulation is carried.Flash distillation wave pressure supercharger 13 is three port flash distillation wave rotor boosters, and steam jet ejector 17 is for entering to drive steam in centre, and ring week enters low-pressure secondary steam.

Claims (2)

1. a flash distillation wave steam recompression continuous evaporation system, it comprises a multi-effect evaporator, heavy liquor pump (5), condensate pump (6), thermal source heat exchanger (11), multi-effect evaporator is made up of first evaporator (9), secondary single-effect evaporator (8) and last evaporator (3), it is characterized in that: further comprising a flash distillation wave pressure supercharger (13), booster pump (10) and vavuum pump (1), the bottom of adjacent each single-effect evaporator adopts communicating pipe (16) to connect, and also adopts the circulating pump of each single-effect evaporator to connect liquid uniform device in this single-effect evaporator; Outlet is saturated or the thermal source heat exchanger (11) of overheated aqueous water connects the driving heat source entrance (WH) of flash distillation wave pressure supercharger (13) and regulates first control valve (12) of flash distillation wave pressure supercharger (13) inlet temperature, pressurized outlet (WM) head connected in first evaporator (9) of flash distillation wave pressure supercharger (13) imitates heat exchanger (9a), and the upper space of last evaporator (3) adopts pipeline to connect the low-pressure steam inlet (WL) of flash distillation wave pressure supercharger (13); Described first evaporator (9) upper space connects the secondary effect heat exchanger (8a) in time single-effect evaporator (8) by pipeline, by that analogy, prime time single-effect evaporator upper space connects the secondary effect heat exchanger in rear class time single-effect evaporator by pipeline, and final stage time single-effect evaporator upper space connects the end effect heat exchanger (3a) in last evaporator (3) by pipeline; Stoste enters from the stoste import of the condenser (4) being positioned at last evaporator (3) upper space, enter in first evaporator (9) through stoste pipe (14), the bottom of last evaporator (3) connects heavy liquor pump (5), is provided with solidifying water connects dish (18) in the bottom of condenser (4); The upper space of described last evaporator (3) adopts pipeline to connect vavuum pump (1) through steam-water separator (2); In described each single-effect evaporator, the outlet of each effect heat exchanger connects with solidifying water the water inlet coiling (18) and be jointly connected booster pump (10) and condensate pump (6), and booster pump (10) connects thermal source heat exchanger (11) through regulating second control valve (15) of flash distillation wave pressure supercharger (13) inlet pressure.
2. a kind of flash distillation wave steam recompression continuous evaporation system according to claim 1, it is characterized in that: the upper space of described last evaporator (3) adopts pipeline to be connected to the low-pressure steam inlet (JL) of steam jet ejector (17), the pressurized outlet (JM) of steam jet ejector (17) connects the low-pressure steam inlet (WL) of flash distillation wave pressure supercharger (13), drives steam to enter from the high pressure entry (JH) of steam jet ejector.
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