CN104667550A - MVR continuous evaporation system - Google Patents
MVR continuous evaporation system Download PDFInfo
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- CN104667550A CN104667550A CN201510066392.6A CN201510066392A CN104667550A CN 104667550 A CN104667550 A CN 104667550A CN 201510066392 A CN201510066392 A CN 201510066392A CN 104667550 A CN104667550 A CN 104667550A
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Abstract
The invention discloses an MVR continuous evaporation system. The system can be applied to the requirements on different evaporation pressures, and automatic control of continuous and stable feeding and continuous discharging can be realized. The system disclosed by the invention comprises a raw material balance tank, a main body evaporator, a gas-liquid separator, a condensate storage tank, a steam compressor, a vacuum system and at least three heat exchange devices which are connected by virtue of pipelines, control valves and related pumps, wherein the bottom of the raw material balance tank is connected with the inlet of a feeding pump and is connected with an interval inlet of the top end of the main body evaporator by virtue of a heat exchange device; multiple evaporation intervals are contained in the main body evaporator; a gas-liquid collection cavity is formed in the bottom end of the main body evaporator and is connected with the next evaporation interval by virtue of a booster pump; the concentrated solution in the final evaporation interval is used for preheating the raw materials by virtue of the heat exchange devices; the shell pass of the main body evaporator is connected with the condensate storage tank; and steam condensate is connected with the heat exchange devices by virtue of the condensate storage tank, and the raw materials can be preheated.
Description
Technical field
The present invention relates to a kind of vapo(u)rization system, more specifically to a kind of MVR continuous evaporation system.
Background technology
Evaporation and concentration is operating unit important in industrial processes, especially in fermentation, and wastewater treatment, chemical industry, the field such as desalinization and papermaking.Main heating source used in traditional evaporation technology is steam, evaporation equipment is the multi-effect evaporation system adopting falling film evaporator to form, although multi-effect evaporation system repeatedly can utilize indirect steam and repeat to make use of heat energy, but still need to consume a large amount of steam, and increasing along with effect number, the utilization rate of steam latent heat can reduce, and volume ratio is huger.
The english abbreviation of MVR and mechanical steam recompression technology, English full name is Mechanical Vapor Recompression.Its main technical characterstic is whole indirect steams system produced improve steam temperature by the recompression of vapour compression machine, and pressure and heat enthalpy value, again as heat source feed liquid.Therefore, MVR vapo(u)rization system except needing a small amount of startup steam, the part electric energy that the just vapour compression machine running of system stable operation post consumption needs.From the source and utilization rate of the energy, the added value that the burning that steam mainly comes from coal produces, not only consume a large amount of non-renewable resources but also comparatively large to the pollution of environment, and the source of electric energy is relatively extensive, pollutes relatively little.MVR is a kind of steam internal circulation system, and has loss in indirect steam recycling process, and therefore the operation stability of MVR system is very important.Feeding temperature, inlet amount, evaporation pressure, compressed steam temperature, the factors such as evaporator shell stroke pressure directly affect the stable operation of system, particularly in large-scale industrial production, MVR evaporation concentration system once startup optimization, on its advantage is just embodied in and works continuously.Therefore the key factor of its steady and continuous of system operation of MVR running.
Summary of the invention
The object of the invention is to solve above-mentioned problems of the prior art with not enough, provide a kind of MVR continuous evaporation system, this system goes for the requirement of different evaporating pressure, realizes the Automated condtrol of continous-stable charging and continuous discharge.
The present invention is achieved by the following technical solutions:
MVR continuous evaporation system of the present invention, it includes and passes through pipeline, the material equilibrium tank that control valve and associated pump connect, main body evaporimeter, gas-liquid separator, condensate tank, vapour compression machine, vacuum system and at least three heat-exchanger rigs, the bottom of described material equilibrium tank connects feed pump entrance, and be connected by the interval entrance of heat-exchanger rig with the top of main body evaporimeter, containing multiple evaporation region in described main body evaporimeter, be provided with gas and liquid collecting chamber in the bottom of main body evaporimeter and connect next evaporation region by relay pump successively, the concentrate of last evaporation region by heat-exchanger rig to raw material preheating, the thermal source that continuous evaporation system has just brought into operation comes from the shell side that outside raw steam passes into main body evaporimeter, after in tube side, feed liquid absorbs heat, boiling vaporization produces indirect steam and is connected to vapour compression machine entrance by the separation and purification of gas-liquid separator, high temperature and high pressure steam after overcompression is connected to the shell side of main body evaporimeter again as fresh thermal source, just passing into of outside raw steam is removed after system stability, described main body evaporimeter shell side connects condensate tank, steam condensate (SC) connects heat-exchanger rig by condensate tank, can preheating material, described vacuum system includes vavuum pump, two vacuum condensers, incoagulable gas filter, pressure transmission device and two control valves form, and in main body evaporimeter shell side, the discharge of pressure and incoagulable gas is completed by pressure transmitter and control valve feedback regulation.
MVR continuous evaporation system of the present invention, its further technical scheme liquid level sensor is installed by described material equilibrium tank and forms feedback regulation with feeding pipe, installs flowmeter and control valve FEEDBACK CONTROL at material delivery side of pump simultaneously.
MVR continuous evaporation system of the present invention, its further technical scheme can also be described main body evaporimeter wherein before needs to be preheated to a stable temperature at material liquid entering, first material liquid carries out preheating with condensed water and concentrate respectively in heat-exchanger rig, finally by the heat-exchanger rig taking steam as thermal source, the control valve in the pipeline before material liquid enters main body evaporimeter on mounting temperature sensor and steam pipework forms feedback regulation.
MVR continuous evaporation system of the present invention, its further technical scheme can also be described last evaporation region of main body evaporimeter export pipeline on concentration sensor is installed, Parallel Control is formed respectively from different pipe branch roads, when concentrate concentration does not reach pre-provisioning request, open the control valve leading to compensator; When concentrate concentration reaches pre-provisioning request, open concentrate collecting; When system stop concentrated needing cleaning time, the manually opened valve leading to CIP tank.
MVR continuous evaporation system of the present invention, its further technical scheme can also be that the top of described gas-liquid separator is provided with pressure sensor and forms feedback regulation with the emptying valve of branch road of vapour compression machine import department indirect steam and the live steam valve that leads to main body evaporimeter shell side respectively, when the pressure of system is lower than setting value, open the live steam valve leading to main body evaporimeter shell side and increase steam heat-exchanging amount, to produce more indirect steam improving feed liquid evaporating pressure; When the pressure of system is higher than design load, open the emptying valve of branch road of vapour compression machine import department indirect steam, a small amount of indirect steam and incoagulable gas are while discharge, the pressure of feed liquid vapo(u)rization system is corresponding also to be reduced, focus on incoagulable gas filter bottom through condensed indirect steam condensate liquid, incoagulable gas is then by outside vavuum pump discharge system.
MVR continuous evaporation system of the present invention, its further technical scheme can also be the control valve feedback regulation of setting pressure sensor and vacuum system on described main body evaporimeter shell side, when shell side pressure exceedes setting value, opening controlling valve door switch is to reduce shell side pressure, and this vacuum system shares an incoagulable gas filter and vavuum pump with the vacuum system controlling feed liquid evaporating pressure; Incoagulable gas filter is installed liquid level sensor and condensate pump FEEDBACK CONTROL, when steam condensate exceedes regulation liquid level, open condensate pump switch and discharge unnecessary condensed water; Steam condensate in main body evaporimeter shell side enters condensate tank and squeezes into heat-exchanger rig by condensate pump carries out preheating to raw material, and condensate tank is installed the control valve feedback regulation that liquid level sensor and condensate pump export.
MVR continuous evaporation system of the present invention, its further technical scheme can also be described vapour compression machine outlet mounting temperature sensor and the branch road valve feedback regulation of vapour compression machine import moisturizing, regulates corresponding rate of water make-up according to the change of vapor (steam) temperature.
In MVR continuous evaporation system of the present invention, its further technical scheme can also be that described main body evaporimeter is falling liquid film, rises film or lift-film evaporator; Vapour compression machine is centrifugal compressor or lobed rotor compressor.
Compared with prior art the present invention has following beneficial effect:
1. feed rate is stablized: on material equilibrium tank, install liquid level sensor and form feedback regulation with feeding pipe, ensures that the feed liquid material in material equilibrium is stablized, guarantees the state that there will not be cutout.At material delivery side of pump, flowmeter and control valve FEEDBACK CONTROL are installed, make continual and steady the entering in system of inlet amount.When evaporating end and needing purging system, only need to control the valve on liquid level gauge and CIP pipeline.
2. feeding temperature is stablized: material liquid needs to be preheated to a stable temperature before entering main body evaporimeter, first material liquid carries out preheating with condensed water and concentrate respectively in heat-exchanger rig, finally by the heat-exchanger rig taking steam as thermal source, the control valve that pipeline before feed liquid enters main body evaporimeter dodges on mounting temperature sensor and steam pipework forms feedback regulation, and the flow mainly by controlling steam reaches the stable of feeding temperature.
3. the concentration stabilize of concentrate: main body evaporimeter adopts by stages to arrange, squeezed into next interval after material liquid enters one of them interval evaporation and concentration in the different gas and liquid collecting chambeies of base of evaporator successively by relay pump, the export pipeline of final concentrate is provided with concentration sensor, Parallel Control is formed respectively from different pipe branch roads, when concentrate concentration does not reach pre-provisioning request, open the control valve leading to compensator; When concentrate concentration reaches pre-provisioning request, open concentrate collecting; When system stop concentrated needing cleaning time, the manually opened valve leading to CIP tank.
4. feed liquid evaporating pressure is stablized: the control of vacuum needs a set of vacuum plant system, comprising vacuum condenser, and incoagulable gas filter, the auxiliary devices such as vavuum pump.A pressure sensor is installed on the top of gas-liquid separator and forms feedback regulation with the emptying valve of the branch road of compressor inlet indirect steam with towards the live steam valve of evaporimeter shell side respectively, when the pressure of system is lower than setting value, open the live steam valve leading to evaporimeter shell side and increase steam heat-exchanging amount, to produce more indirect steam improving feed liquid evaporating pressure; When the pressure of system is higher than design load, open the emptying valve of branch road of compressor inlet indirect steam, a small amount of indirect steam and incoagulable gas are while discharge, the pressure of feed liquid vapo(u)rization system is corresponding also to be reduced, focus on incoagulable gas filter bottom through condensed indirect steam condensate liquid, incoagulable gas is then by outside vavuum pump discharge system.
5. evaporator shell stroke pressure is stablized: owing to being mingled with the reasons such as the sealing of incoagulable gas and system in feed liquid, and in system, incoagulable gas can be cumulative and finally concentrate in the shell side of main body evaporimeter and cause pressure to raise gradually.The control valve feedback regulation of setting pressure sensor and vacuum system on evaporimeter shell side, when shell side pressure exceedes setting value, opening controlling valve door switch is to reduce shell side pressure, and this vacuum system shares an incoagulable gas filter and vavuum pump with the vacuum system controlling feed liquid evaporating pressure.Incoagulable gas filter is installed liquid level sensor and condensate pump FEEDBACK CONTROL, when steam condensate exceedes regulation liquid level, open condensate pump switch and discharge unnecessary condensed water.Steam condensate in main body evaporimeter shell side enters condensate tank and squeezes into heat-exchanger rig by condensate pump carries out preheating to raw material, condensate tank is installed the control valve feedback regulation that liquid level sensor and condensate pump export, makes the continuity of equipment operation.
6. the temperature stabilization of the rear steam of compression: indirect steam is after the compression of vapour compression machine, the superheated steam that the degree of superheat is very high often, in order to eliminate the adverse effect of superheated steam, in the branch road valve feedback regulation of compressor outlet mounting temperature sensor and compressor inlet moisturizing, regulate corresponding rate of water make-up according to the change of vapor (steam) temperature.
Accompanying drawing explanation
Fig. 1 is a kind of MVR continuous evaporation system schematic of the present invention.
In figure, 1: material equilibrium tank; 2,3,8: heat-exchanger rig; 4: condensate tank; 5: gas-liquid separator; 6: main body evaporimeter; 7: vapour compression machine; 9,10: vacuum condenser; 11: incoagulable gas filter; 12,15,16: liquid level sensor; 14: densimeter; 17,18: pressure sensor; 19,33: temperature sensor; 22: flowmeter, 20,21,22,23,24,25,26,27,28,29,30,31,32: control valve; Vp101: vavuum pump; Pp101, pp102, pp103, pp104, pp105, pp106, pp107, pp108: delivery pump.
Fig. 2 is the interval distribution of specific embodiment of the invention main body evaporimeter.
In figure, 34: one is interval; 35: two is interval; 36: three is interval; 37: four is interval.
Detailed description of the invention
Embodiment one
Below in conjunction with drawings and Examples, the present invention is further described, MVR continuous evaporation system of the present invention, it includes and passes through pipeline, the material equilibrium tank 1 that control valve and associated pump connect, main body evaporimeter 6, gas-liquid separator 5, condensate tank 4, vapour compression machine 7, vacuum system and three heat-exchanger rigs 2, 3, 8, the bottom of described material equilibrium tank 1 connects feed pump entrance, and by heat-exchanger rig 2, 3 are connected with an interval entrance on the top of main body evaporimeter 6, containing four evaporation regions 34 in described main body evaporimeter 6, 35, 36, 37, be provided with gas and liquid collecting chamber in the bottom of main body evaporimeter 6 and connect next evaporation region by relay pump successively, the concentrate of last evaporation region is by heat-exchanger rig 8 pairs of raw material preheatings, the thermal source that continuous evaporation system has just brought into operation comes from the shell side that outside raw steam passes into main body evaporimeter 6, after in tube side, feed liquid absorbs heat, boiling vaporization produces indirect steam and is connected to vapour compression machine 7 entrance by the separation and purification of gas-liquid separator 5, high temperature and high pressure steam after overcompression is connected to the shell side of main body evaporimeter 6 again as fresh thermal source, just passing into of outside raw steam is removed after system stability, described main body evaporimeter 6 shell side connects condensate tank 4, steam condensate (SC) connects heat-exchanger rig 3 by condensate tank 4, can preheating material, described vacuum system include vavuum pump, two vacuum condensers 9,10, incoagulable gas filter 11, pressure transmission device and two control valves form, in main body evaporimeter shell side, the discharge of pressure and incoagulable gas is completed by pressure transmitter and control valve feedback regulation.
Liquid level sensor 12 installed by wherein said material equilibrium tank 1 and forms feedback regulation with feeding pipe, at material delivery side of pump, flowmeter 13 and control valve 22 FEEDBACK CONTROL being installed simultaneously.Described main body evaporimeter 6 wherein before needs to be preheated to a stable temperature at material liquid entering, first material liquid respectively with condensed water and concentrate at heat-exchanger rig 2, preheating is carried out in 3, finally by the heat-exchanger rig 8 taking steam as thermal source, the control valve 24 in the pipeline before material liquid enters main body evaporimeter on mounting temperature sensor and steam pipework forms feedback regulation.The export pipeline of described last evaporation region of main body evaporimeter 6 is provided with concentration sensor 14, forms Parallel Control from different pipe branch roads respectively, when concentrate concentration does not reach pre-provisioning request, open the control valve 30 leading to compensator; When concentrate concentration reaches pre-provisioning request, open concentrate collecting 31; When system stop concentrated needing cleaning time, the manually opened valve leading to CIP tank.The top of described gas-liquid separator is provided with pressure sensor 17 and forms feedback regulation with the emptying valve 27 of branch road of vapour compression machine import department indirect steam and the live steam valve 25 that leads to main body evaporimeter shell side respectively, when the pressure of system is lower than setting value, open the live steam valve 25 leading to main body evaporimeter shell side and increase steam heat-exchanging amount, to produce more indirect steam improving feed liquid evaporating pressure; When the pressure of system is higher than design load, open the emptying valve 27 of branch road of vapour compression machine import department indirect steam, a small amount of indirect steam and incoagulable gas are while discharge, the pressure of feed liquid vapo(u)rization system is corresponding also to be reduced, focus on incoagulable gas filter bottom through condensed indirect steam condensate liquid, incoagulable gas is then by outside vavuum pump vp101 discharge system.Control valve 26 feedback regulation of setting pressure sensor 18 and vacuum system on described main body evaporimeter 6 shell side, when shell side pressure exceedes setting value, opening controlling valve door 26 switch is to reduce shell side pressure, and this vacuum system shares an incoagulable gas filter 11 and vavuum pump vp101 with the vacuum system controlling feed liquid evaporating pressure; Incoagulable gas filter 11 is installed liquid level sensor 16 and condensate pump valve 29 FEEDBACK CONTROL, when steam condensate exceedes regulation liquid level, open condensate pump switch 29 and discharge unnecessary condensed water; Steam condensate in main body evaporimeter shell side enters condensate tank 4 and squeezes into heat-exchanger rig by condensate pump pp102 carries out preheating to raw material, and condensate tank is installed control valve 23 feedback regulation that liquid level sensor 15 exports with condensate pump.Described vapour compression machine outlet mounting temperature sensor 19 and branch road valve 28 feedback regulation of vapour compression machine import moisturizing, regulate corresponding rate of water make-up according to the change of vapor (steam) temperature.
MVR evaporation and concentration in MVR continuous evaporation system of the present invention is a kind of thermal balance internal circulation system, is applicable to large-scale continuous operation.One is had to supply the transfer process of heat in MVR running, the startup stage of therefore the production and application process of MVR continuous evaporation system of the present invention being divided into, stable operation stage and wash phase.
Startup stage:
Material from upstream operating mode enters material equilibrium tank 1 by feed pipe, control valve 20 and the liquid level sensor FEEDBACK CONTROL on material equilibrium tank 1 of the control flow on material pipe, stablizes to make the reduction of feed volume in material equilibrium tank 1.Feed liquid in material balance tank 1 enters the warm-up phase of feed liquid under the swabbing action of material-handling pump pp101, wherein installs flowmeter 13 and flow control valve 22 to make the input of the feed liquid continous-stable entering vapo(u)rization system at the port of export of product pump pp101.Heat-exchanger rig 2 during owing to just starting, thermal source is not had in 3, need to start heat-exchanger rig 8 and the heat heating raw of the outside raw steam of utilization, feed liquid after preheating enters the interval 34 in main body evaporimeter 6, then open corresponding interval relay pump pp103 below main body evaporimeter 6 and squeeze into next interval 35, the like, finally export from interval 37 feed liquids out through product pump pp106, because this stage feed liquid does not also concentrate, need opening controlling valve door 30 that feed liquid is returned material equilibrium tank 1, so far, Matter Transfer pipeline is unimpeded.
After material pipeline systemic circulation is unimpeded, the pipe-line control valve door 25 pairs of feed liquids opening the raw steam of foreign aid heat, and during because just starting, in main body evaporimeter 6 shell side, incoagulable gas is more, and opening controlling valve 26 discharges unnecessary incoagulable gas.Open the control valve 27 of vavuum pump vp101 and control feed liquid evaporating pressure, discharge the pressure of incoagulable gas and the evaporation of control feed liquid in evaporation system.Feed liquid produces indirect steam because absorbing heat boiling vaporization, and open vapour compression machine 7 and operate under the comparatively slow-speed of revolution, the steam that indirect steam becomes HTHP under the effect of vapour compression machine 7 enters the shell side of main body evaporimeter 6, and by the temperature sensor 19 on compressed steam export pipeline and control valve 28 feedback regulation on moisturizing pipeline, eliminate the overheated of compressed steam.
In main body evaporimeter 6, steam condensate enters condensate tank 4, and is delivered to heat-exchanger rig 3 pairs of raw materials by condensate pump pp102 and carries out preliminary preheating, and after preheating, condensed water enters in circulation.After evaporation and concentration, feed liquid contains higher liquid heat, and be first delivered to heat-exchanger rig 2 by feed liquid delivery pump pp106, concentrate is delivered in subsequent processing the most at last.
Stable operation stage:
After cell node equipment all in MVR evaporation concentration system gets into smooth all, progressively improve the rotating speed of vapour compression machine 7 to required rated speed.To set after feeding temperature with temperature sensor 33 as instruction, transfer flow adjusting valve for steam 24 to automatic control.After setting feed liquid evaporating pressure, with pressure sensor 17 for instruction, coupling supplements the valve 25 of steam pipework and discharges incoagulable gas, the valve 27 of a small amount of indirect steam, and when evaporating pressure is lower than design load, valve 25 is opened; When evaporating pressure is higher than design load, valve 27 is opened.Pressure change building up mainly because of incoagulable gas in main body evaporimeter 6 shell side, with pressure sensor 18 for instruction coupling control valve 26, when the pressure in shell side is higher than design load, incoagulable gas to be introduced in vacuum system and finally to be discharged by vavuum pump vp101 by automatic Open valve 26.Along with the carrying out of evaporation and concentration, in incoagulable gas filter 11, condensate liquid increases, by gate out switch 29 feedback regulation of liquid level sensor 16 with condensate pump pp108, when liquid level is higher than design load, the switch of automatic unlatching condensate pump pp108 and outlet valve 29, when liquid level is lower than design load, automatically close switch and the outlet valve 29 of condensate pump pp108.Little when eliminating the amount of supplementing water required for superheated steam, generally select low-capacity pump pp107, when steam exit temperature is higher than setting value, automatically strengthen the aperture of control valve 28, when steam exit temperature is lower than setting value, automatically reduce the aperture of control valve 28.Densimeter 14 selects different flow paths according to the concentration of final concentrate, when concentrate concentration reaches setting value requirement, concentrate is transported in subsequent processing by automatic Open valve 31, when the concentration of concentrate is lower than setting value, concentrate is squeezed in material equilibrium tank 1 and is carried out secondary concentration by automatic Open valve 30.
After all Controlling vertex are all adjusted to automatic control, concentrate on an enterprising line operate in PLC control panel face.System just can realize the concentrated operation of continuous evaporation.
Wash phase:
When after MVR continuous batch of end of run, close the operational outfit of vacuum system and stop the running of vapour compression machine, by the pipeline Close All of raw for foreign aid steam.Only need the liquid level sensor on material equilibrium tank 1 and change into and control valve 21 feedback regulation on CIP pipeline, the control that is simultaneously coupled by densimeter 14 transfers manual adjustments to, opening controlling valve 32, and cleaning fluid is back to CIP tank.
Practice:
Certain amino acid liquid waste processing amount is 3t/h, and feeding liquid concentration is 5%, feeding temperature 30 DEG C, and out-feed liquid concentration requirement is 15%, and main body evaporimeter is selected downward film evaporator and is divided into four evaporation regions, and total disengagement area is 130m
2.Vapour compression machine is selected Roots Compressor and is equipped with the motor that power is 70kw.Control valve all selects pneumatic operated valve and jettron, also there are other various instrument, comprise liquid level sensor, pressure sensor in native system, and temperature sensor etc. are all identical with existing instrumentation.Concrete implementing process is as follows: the amino acid waste liquid of 30 DEG C enters in MVR evaporation concentration system with the flow of 3t/h, under the heat exchange of pre-heating system, temperature when waste liquid enters falling film evaporator is 72 DEG C, feed liquid evaporating pressure controls 0.32bar (corresponding vapo(u)rous temperature is 70 DEG C), the pressure of the raw steam of foreign aid is 2.5bar (absolute pressure), and the pressure setting that compressor outlet is connected is 0.52bar (absolute pressure).The temperature of compressed steam is set as 85 DEG C, and the densimeter setting value of discharging place is 15%.Under described process control condition, system achieves whole Automated condtrol, and one batch has been run 15 days continuously.
Claims (8)
1. a MVR continuous evaporation system, it is characterized in that including and pass through pipeline, the material equilibrium tank that control valve and associated pump connect, main body evaporimeter, gas-liquid separator, condensate tank, vapour compression machine, vacuum system and at least three heat-exchanger rigs, the bottom of described material equilibrium tank connects feed pump entrance, and be connected by the interval entrance of heat-exchanger rig with the top of main body evaporimeter, containing multiple evaporation region in described main body evaporimeter, be provided with gas and liquid collecting chamber in the bottom of main body evaporimeter and connect next evaporation region by relay pump successively, the concentrate of last evaporation region by heat-exchanger rig to raw material preheating, the thermal source that continuous evaporation system has just brought into operation comes from the shell side that outside raw steam passes into main body evaporimeter, after in tube side, feed liquid absorbs heat, boiling vaporization produces indirect steam and is connected to vapour compression machine entrance by the separation and purification of gas-liquid separator, high temperature and high pressure steam after overcompression is connected to the shell side of main body evaporimeter again as fresh thermal source, just passing into of outside raw steam is removed after system stability, described main body evaporimeter shell side connects condensate tank, steam condensate (SC) connects heat-exchanger rig by condensate tank, can preheating material, described vacuum system includes vavuum pump, two vacuum condensers, incoagulable gas filter, pressure transmission device and two control valves form, and in main body evaporimeter shell side, the discharge of pressure and incoagulable gas is completed by pressure transmitter and control valve feedback regulation.
2. MVR continuous evaporation system according to claim 1, is characterized in that liquid level sensor being installed by described material equilibrium tank and forming feedback regulation with feeding pipe, installs flowmeter and control valve FEEDBACK CONTROL at material delivery side of pump simultaneously.
3. MVR continuous evaporation system according to claim 1, it is characterized in that described main body evaporimeter wherein before needs to be preheated to a stable temperature at material liquid entering, first material liquid carries out preheating with condensed water and concentrate respectively in heat-exchanger rig, finally by the heat-exchanger rig taking steam as thermal source, the control valve in the pipeline before material liquid enters main body evaporimeter on mounting temperature sensor and steam pipework forms feedback regulation.
4. MVR continuous evaporation system according to claim 1, the export pipeline that it is characterized in that described last evaporation region of main body evaporimeter is provided with concentration sensor, Parallel Control is formed respectively from different pipe branch roads, when concentrate concentration does not reach pre-provisioning request, open the control valve leading to compensator; When concentrate concentration reaches pre-provisioning request, open concentrate collecting; When system stop concentrated needing cleaning time, the manually opened valve leading to CIP tank.
5. MVR continuous evaporation system according to claim 1, it is characterized in that the top of described gas-liquid separator is provided with pressure sensor and forms feedback regulation with the emptying valve of branch road of vapour compression machine import department indirect steam and the live steam valve that leads to main body evaporimeter shell side respectively, when the pressure of system is lower than setting value, open the live steam valve leading to main body evaporimeter shell side and increase steam heat-exchanging amount, to produce more indirect steam improving feed liquid evaporating pressure; When the pressure of system is higher than design load, open the emptying valve of branch road of vapour compression machine import department indirect steam, a small amount of indirect steam and incoagulable gas are while discharge, the pressure of feed liquid vapo(u)rization system is corresponding also to be reduced, focus on incoagulable gas filter bottom through condensed indirect steam condensate liquid, incoagulable gas is then by outside vavuum pump discharge system.
6. MVR continuous evaporation system according to claim 1, it is characterized in that the control valve feedback regulation of setting pressure sensor and vacuum system on described main body evaporimeter shell side, when shell side pressure exceedes setting value, opening controlling valve door switch is to reduce shell side pressure, and this vacuum system shares an incoagulable gas filter and vavuum pump with the vacuum system controlling feed liquid evaporating pressure; Incoagulable gas filter is installed liquid level sensor and condensate pump FEEDBACK CONTROL, when steam condensate exceedes regulation liquid level, open condensate pump switch and discharge unnecessary condensed water; Steam condensate in main body evaporimeter shell side enters condensate tank and squeezes into heat-exchanger rig by condensate pump carries out preheating to raw material, and condensate tank is installed the control valve feedback regulation that liquid level sensor and condensate pump export.
7. MVR continuous evaporation system according to claim 1, is characterized in that described vapour compression machine outlet mounting temperature sensor and the branch road valve feedback regulation of vapour compression machine import moisturizing, regulates corresponding rate of water make-up according to the change of vapor (steam) temperature.
8. MVR continuous evaporation system according to claim 1, is characterized in that described main body evaporimeter is falling liquid film, rises film or lift-film evaporator; Described vapour compression machine is centrifugal compressor or lobed rotor compressor.
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| CN109381878A (en) * | 2018-12-21 | 2019-02-26 | 北京师范大学 | A kind of water-saving rotary evaporation enrichment facility of energy conservation and environmental protection |
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| CN113963832A (en) * | 2021-11-30 | 2022-01-21 | 中国原子能科学研究院 | Heat pump evaporation treatment system and method for radioactive waste liquid treatment |
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