CN104436728A - WVR (wave vapor recompression) continuous vaporization system - Google Patents

WVR (wave vapor recompression) continuous vaporization system Download PDF

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CN104436728A
CN104436728A CN201410707512.1A CN201410707512A CN104436728A CN 104436728 A CN104436728 A CN 104436728A CN 201410707512 A CN201410707512 A CN 201410707512A CN 104436728 A CN104436728 A CN 104436728A
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evaporator
effect
steam
wave
upper space
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CN104436728B (en
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代玉强
胡大鹏
刘凤霞
程永航
朱彻
邹久朋
张斯亮
陶盛洋
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Dalian University of Technology
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Dalian University of Technology
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Abstract

The invention relates to a WVR (wave vapor recompression) continuous vaporization system and belongs to the technical field of thermal evaporation. The core is that a phase-change wave supercharger is introduced, WVR is finished by using shock wave heating and the supercharge characteristic, two systems, namely, a WVR system and a wave supercharge/mechanical compression system, are combined for use, last-effect secondary vapor enters the phase-change wave supercharger for recompression and enters a primary-effect evaporator as a driving heat source after the energy grade is increased, and the produced secondary vapor is continuously evaporated as a secondary-effect heat source after separated by a gas-liquid separation module; an original liquid is sent out of devices by pumps after concentrated by each evaporator to be saturated. The system is simple, solves the problem that vapor compressors are difficult to design and manufacture and has the advantage that the supercharge efficiency is higher than that of a steam ejector.

Description

A kind of wave steam recompression continuous evaporation system
Technical field
The present invention relates to a kind of wave steam recompression continuous evaporation system, belong to hot method evaporation technique field.
Background technology
The high-salt wastewater that salinity is greater than 1% 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 special hot method treatment technology of one, the feature of function of mechanical steam recompression (MVR) technology recompresses the whole indirect steam of end effect under vacuum, to make full use of latent heat, improve capacity usage ratio, use it for wastewater treatment, operating cost can reach the level suitable with embrane method technology, and economic and social benefit is considerable.But but there is a more difficult problem in the exploitation of MVR Special vacuum vapour compression machine, as: rotating speed is fast, size is large and efficiency is low etc., and the large-scale promotion in fact having hindered mechanical vapor recompression technology uses.
Adopt wave rotor (Wave Rotor) charging efficiency based on UNSTEADY FLOW process higher than the charging efficiency of steady flow process, this technology is without the need to the parts such as piston or blade, and the DIRECT ENERGY that just can efficiently complete between high and low pressure fluid by means of only the Shock-Motion produced exchanges.CN101290174 patent 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, but only make use of its bulking effect at present.
Summary of the invention
In order to overcome problems of the prior art, the invention provides a kind of wave steam recompression continuous evaporation system, its object is to make full use of shock wave and heat effect, energy utilization efficiency is provided.
The technical solution used in the present invention is: a kind of wave steam recompression continuous evaporation system, it comprises multi-effect evaporator, heavy liquor pump, condensate pump and a steam boiler, multi-effect evaporator is made up of first evaporator, several single-effect evaporators and last evaporator, it also comprises a phase transformation wave pressure supercharger and 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; The driving steam (vapor) outlet of described steam boiler connects the driving steam inlet of phase transformation wave pressure supercharger, the head that the pressurised steam outlet of phase transformation 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 phase transformation 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 steam boiler and condensate pump.
The upper space of described last evaporator adopts pipeline to be connected low-pressure steam inlet, the bottom connection steam boiler of gas-liquid separator and the water inlet of condensate pump of phase transformation wave pressure supercharger successively with gas-liquid separator through vapour compression machine, the heat exchanger that is positioned at first evaporator upper space.
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.
What technique scheme utilized shock wave heats effect and boost performance, constructs a kind of novel wave steam recompression mechanism, utilizes phase transformation wave pressure supercharger to replace or part replaces water vapour compressor in realized system.Wherein, the driving heat source of phase transformation wave pressure supercharger is low-calorie steam, is end effect secondary steam by purging stream, and supercharging and overheated rear re-using latent heat, to reach energy-conservation object.
According to the actual state of stoste evaporating temperature, the recompression ratio of indirect steam has dividing of height, and employing mechanical vapor-compression+wave both vapor compression coupling and wave steam can be had to recompress two kinds of implementation methods.For medium and high temperature evaporation situation, low vacuum, indirect steam pressure ratio is low, only adopts phase transformation complex supercharge to complete, namely adopts WVR technique.For low-temperature evaporation situation, vacuum is high, and supercharging pressure ratio is high, and the low-pressure ratio mechanical vapor-compression MVR(that progression can be adopted to reduce compressor development difficulty at this moment reduces) hybrid technique of+phase transformation gas unsteady flo w precommpression WVR, i.e. M/WVR technique.
The invention has the beneficial effects as follows: the wave steam recompression WVR technology that this wave steam recompression continuous evaporation system proposes, compare existing machinery steam recompression MVR and thermodynamic steam recompression TVR technology, there is following technical advantage:
One, relative to function of mechanical steam recompression MVR technology, WVR technology is without an equipment development difficult problem, and thermodynamic advantages is that shock wave heats effect and can make full use of, and unsteady flo w charging efficiency is high.From heating angle, WVR technology makes full use of the thermal release phenomenon of Shock-Motion, owing to driving steam can experience expansion, excessive expansion condensation process, therefore drives steam will discharge more sensible heat and latent heat, heats, provide energy utilization efficiency for shock wave; From supercharging angle, the unsteady flo w pressurization efficiency of WVR technology is higher, and without an equipment development difficult problem.
Two, relative to thermodynamic steam recompression TVR technology, the advantage of WVR technology is the efficiency of charging efficiency far above steam jet ejector, and drive the overexpansion condensation process of steam the latent heat of more release to be used, steam jet ejector can only complete an expansion process, drives the latent heat utilization rate of steam low.
Three, WVR technology 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.Wave rotor thermal release characteristic determines and drives steam upon inflation excessive condensation phenomenon can occur, and this point is different from mechanical vapor-compression process whole process for superheated steam.The present invention, can with the condensation driving steam while making full use of driving steam latent heat (condensing pressure is lower), and the Two-ports structure of wave rotor can guarantee that it possesses excellent band liquid operating characteristics.
Accompanying drawing explanation
Fig. 1 is a kind of wave steam recompression continuous evaporation system diagram.
Fig. 2 is that a kind of function of mechanical steam recompression and wave steam recompress the continuous evaporation system diagram be combined.
In figure: 1, vavuum pump, 2, steam-water separator, 3, last evaporator, 3a, end effect heat exchanger, 3b, end effect liquid uniform device, 3c, condenser, 4, heavy liquor pump, 5, condensate pump, 6, first effect circulating pump, 6a, secondary effect circulating pump, 6b, end effect circulating pump, 7, secondary single-effect evaporator, 7a, secondary effect heat exchanger, 7b, secondary effect liquid uniform device, 8, first evaporator, 8a, first effect heat exchanger, 8b, first effect liquid uniform device, 8c, heat exchanger, 9, steam boiler, 10, phase transformation wave pressure supercharger, 11, gas-liquid separator, 12, vapour compression machine, 13, solidifying water connects dish, 14, communicating pipe, 15, stoste pipe, H, driving steam inlet, L, low-pressure steam inlet, M, pressurised steam export.
Detailed description of the invention
Below in conjunction with embodiment and accompanying drawing, the present invention is described in more detail.
embodiment 1utilize the recompression driving steam to complete indirect steam in phase transformation wave pressure supercharger.
Fig. 1 shows a kind of wave steam recompression continuous evaporation system.In figure, wave steam recompression continuous evaporation system comprises a triple effect evaporator, heavy liquor pump 4, condensate pump 5, steam boiler 9, phase transformation wave pressure supercharger 10 and vavuum pump 1, triple effect evaporator is made up of first evaporator 8, secondary single-effect evaporator 7 and last evaporator 3, and first evaporator 8 adopts communicating pipe 14 to be connected to each other with time single-effect evaporator 7, secondary single-effect evaporator 7 with the bottom of last evaporator 3.Adopt the head of first evaporator 8 to imitate circulating pump 6 head connected in first evaporator 8 and imitate liquid uniform device 8b, adopt time effect liquid uniform device 7b in the secondary effect circulating pump 6a connection time single-effect evaporator 7 of time single-effect evaporator 7, adopt the end effect liquid uniform device 3b in the end effect circulating pump 6b connection last evaporator 3 of last evaporator 3.The driving steam (vapor) outlet of steam boiler 9 connects the driving steam inlet H of phase transformation wave pressure supercharger 10, the head that the pressurised steam outlet M of phase transformation wave pressure supercharger 10 connects in first evaporator 8 imitates heat exchanger 8a, and the upper space of last evaporator 3 adopts pipeline to connect the low-pressure steam inlet L of phase transformation wave pressure supercharger 10.First evaporator 8 upper space connects the secondary effect heat exchanger 7a in time single-effect evaporator 7 by pipeline, and secondary effect heat exchanger 7a upper space connects the end effect heat exchanger 3a in last evaporator 3 by pipeline.Stoste enters from the stoste import of the condenser 3c being positioned at last evaporator 3 upper space, enters in first evaporator 8 through stoste pipe 15, and the bottom of last evaporator 3 connects heavy liquor pump 4, is provided with solidifying water connects dish 13 in the bottom of condenser 3c.The upper space of last evaporator 3 adopts pipeline to connect vavuum pump 1 through steam-water separator 2.First effect heat exchanger 8a, secondary effect heat exchanger 7a connect the common water inlet being connected steam boiler 9 and condensate pump 5 of dish 13 with the outlet of end effect heat exchanger 3a with solidifying water.
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.Phase transformation wave pressure supercharger 10 is three port wave rotor boosters.
Wave steam boosting (WVR) vapo(u)rization system is applied to the fields such as salt mine pretreatment, saline sewage process and desalinization.
Stoste enters in first evaporator 8 after entering the condenser 3c preheating in last evaporator 3; Enter after end effect secondary steam condensation portion steam in phase transformation wave pressure supercharger 10, utilize and drive steam to produce heating and supercharging mechanism of unsteady flo w shock wave, stream stock heat content increases, enter first evaporator 8 as driving heat source, the indirect steam that first effect evaporation produces enters time single-effect evaporator 7 and serves as driving heat source, stoste after first effect evaporation utilizes pressure reduction to be delivered in time single-effect evaporator 7 to evaporate further, carries out, until original liquid concentration reaches technique needs or crystallization saturated concentration, being exported by heavy liquor pump 4 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 2combine the recompression utilizing and complete indirect steam in vapour compression machine and phase transformation wave pressure supercharger.
Fig. 2 shows a kind of mechanical vapor-compression and wave steam recompresses 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 the low-pressure steam inlet L of phase transformation wave pressure supercharger 10 successively with gas-liquid separator 11 through vapour compression machine 12, the heat exchanger 8c that is positioned at first evaporator 8 upper space, and the bottom of gas-liquid separator 11 connects the water inlet of steam boiler 9 and condensate pump 5.
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.Phase transformation wave pressure supercharger 10 is three port wave rotor boosters, and vapour compression machine is low-pressure ratio vapour compression machine.
The vapo(u)rization system that function of mechanical steam recompression and wave steam boosting coupling (M/WVR) are formed is applied to the fields such as salt mine pretreatment, saline sewage process and desalinization.
Stoste enters in first evaporator 8 after entering the condenser 3c preheating in last evaporator 3, enter vapour compression machine 12 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 first evaporator and reclaims sensible heat, enter gas-liquid separator 11, enter in phase transformation wave pressure supercharger 10 after being separated lime set, utilize heating and supercharging mechanism of the unsteady flo w shock wave driving steam to produce, stream stock heat content increases, enter first evaporator as driving heat source, the indirect steam that first effect evaporation produces enters time single-effect evaporator 7 and serves as driving heat source, feed liquid after first effect evaporation utilizes pressure reduction to be delivered in time single-effect evaporator 7 to evaporate further, carry out until feed concentration reaches technique needs or crystallization saturated concentration with this, exported by heavy liquor pump 4.
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.Phase transformation wave pressure supercharger 10 is three port wave rotor boosters, and described vapour compression machine is low-pressure ratio vapour compression machine.

Claims (2)

1. a wave steam recompression continuous evaporation system, it comprises a multi-effect evaporator, heavy liquor pump (4), condensate pump (5) and steam boiler (9), multi-effect evaporator is made up of first evaporator (8), several single-effect evaporators (7) and last evaporator (3), it is characterized in that: further comprising a phase transformation wave pressure supercharger (10) and vavuum pump (1), the bottom of adjacent each single-effect evaporator adopts communicating pipe (14) to connect, and also adopts the circulating pump of each single-effect evaporator to connect liquid uniform device in this single-effect evaporator; The driving steam (vapor) outlet of described steam boiler (9) connects the driving steam inlet (H) of phase transformation wave pressure supercharger (10), pressurised steam outlet (M) head connected in first evaporator (8) of phase transformation wave pressure supercharger (10) imitates heat exchanger (8a), and the upper space of last evaporator (3) adopts pipeline to connect the low-pressure steam inlet (L) of phase transformation wave pressure supercharger (10); Described first evaporator (8) upper space connects the secondary effect heat exchanger (7a) in time single-effect evaporator (7) 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 (3c) being positioned at last evaporator (3) upper space, enter in first evaporator (8) through stoste pipe (15), the bottom of last evaporator (3) connects heavy liquor pump (4), is provided with solidifying water connects dish (13) in the bottom of condenser (3c); 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 (13) and be jointly connected steam boiler (9) and condensate pump (5).
2. a kind of wave steam recompression continuous evaporation system according to claims 1, it is characterized in that: the upper space of described last evaporator (3) adopts pipeline to be connected low-pressure steam inlet (L), bottom connection steam boiler (9) of gas-liquid separator (11) and the water inlet of condensate pump (5) of phase transformation wave pressure supercharger (10) successively with gas-liquid separator (11) through vapour compression machine (12), the heat exchanger (8c) that is positioned at first evaporator (8) upper space.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104944486A (en) * 2015-07-20 2015-09-30 周俊云 Multifunctional sewage or waste water treatment equipment

Citations (6)

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Publication number Priority date Publication date Assignee Title
US3616833A (en) * 1967-12-14 1971-11-02 John Moseley Davies Evaporation of liquor
CN201632081U (en) * 2010-02-08 2010-11-17 张国林 Multi-effect vapor recompression vaporization energy-saving system
CN102698451A (en) * 2012-07-05 2012-10-03 大连理工大学 Heat pump type low-temperature evaporating device and method
CN203108242U (en) * 2013-02-28 2013-08-07 上海蓝科石化工程技术有限公司 Double-effect evaporation system used for ammonium sulphate concentration
CN203852855U (en) * 2014-05-06 2014-10-01 郑州海利化工装备有限公司 Six-efficiency three-segment evaporation indirect condensation evaporator group for concentrated sodium aluminate solution
CN204319794U (en) * 2014-12-01 2015-05-13 大连理工大学 A kind of wave steam recompression continuous evaporation device

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3616833A (en) * 1967-12-14 1971-11-02 John Moseley Davies Evaporation of liquor
CN201632081U (en) * 2010-02-08 2010-11-17 张国林 Multi-effect vapor recompression vaporization energy-saving system
CN102698451A (en) * 2012-07-05 2012-10-03 大连理工大学 Heat pump type low-temperature evaporating device and method
CN203108242U (en) * 2013-02-28 2013-08-07 上海蓝科石化工程技术有限公司 Double-effect evaporation system used for ammonium sulphate concentration
CN203852855U (en) * 2014-05-06 2014-10-01 郑州海利化工装备有限公司 Six-efficiency three-segment evaporation indirect condensation evaporator group for concentrated sodium aluminate solution
CN204319794U (en) * 2014-12-01 2015-05-13 大连理工大学 A kind of wave steam recompression continuous evaporation device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104944486A (en) * 2015-07-20 2015-09-30 周俊云 Multifunctional sewage or waste water treatment equipment

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