CN210674264U - MVR system capable of greatly adjusting evaporation yield range - Google Patents
MVR system capable of greatly adjusting evaporation yield range Download PDFInfo
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Abstract
The utility model belongs to the technical field of MVR device, concretely relates to MVR system of adjustment evaporation output scope by a wide margin, this system includes pre-heater, vapor compressor, two at least single effect evaporimeters of establishing ties, a plurality of vapour and liquid separator, establishes diverter valve I on the steam conveying pipeline between two single effect evaporimeters of first, second; a branch pipeline II is additionally arranged on a pipeline between a steam outlet of the first steam-liquid separator and the switching valve I, the branch pipeline II is communicated with a pipeline of a steam inlet of the steam compressor, and the switching valve II is arranged on the branch pipeline II; and a branch pipeline III is arranged on a pipeline between the steam inlet of the second single-effect evaporator and the switching valve I, the branch pipeline III is communicated with a pipeline of a steam outlet of the steam compressor, and the switching valve III is arranged on the branch pipeline III. The MVR system can effectively achieve the technical effect that the MVR system can still stably run under the working condition that the productivity is remarkably reduced.
Description
Technical Field
The utility model relates to a MVR technical field is one kind through single effect evaporation and multiple effect evaporation interconversion, realizes adjusting output range's MVR system by a wide margin.
Background
The MVR evaporation technology has a hundred years history and is widely applied to various industries. Compared with the traditional device which uses steam as energy source to evaporate, the MVR evaporation device can save more than 70% of energy source, and is more energy-saving and environment-friendly. At present, MVR compressors are mainly classified into positive displacement compressors, centrifugal compressors, and high-speed centrifugal compressors in terms of compression form, wherein the high-speed centrifugal compressors are widely applied due to advantages of high efficiency, large temperature rise, small volume, low noise, and the like.
The flow range of the high-speed centrifugal compressor is generally 65% -105% of the design flow, the design flow of the compressor usually meets the upper limit of the flow as the basis, if the flow is lower than the lower limit of the operation range in the production process, surging and other phenomena can occur, the normal work of the compressor is affected, the requirements of enterprises with large capacity change and long-term continuous production are difficult to meet, and for the individual enterprises, a scheme that a plurality of compressors are used in parallel is adopted, so that the investment cost and the management cost are increased greatly.
The method for switching the CN108245912A multi-effect evaporation and MVR system comprises the following steps: the invention provides a method for replacing MVR (mechanical vapor recompression) by multi-effect evaporation of raw steam when a steam compressor fails, which is a method for mutually switching a multi-effect evaporation device using the raw steam and an MVR device.
CN104667550A a MVR continuous evaporation system: the invention provides a method for stably controlling the temperature, the pressure, the flow and the liquid level of an MVR device, which is a method for stably controlling the MVR device through a detection instrument and a control valve and can not solve various problems caused when the change amplitude of the evaporation yield of the MVR exceeds the working range of a compressor.
CN103775353A is a single-stage high-speed centrifugal compressor and method capable of realizing series development; according to the invention, the rotating speed of the centrifugal compressor, the mounting angle of the adjustable inlet guide vane of the centrifugal compressor and the mounting angle of the adjustable radial vane diffuser are jointly adjusted, different pressure ratios are realized by using a single centrifugal compressor, and finally the centrifugal compressor has higher efficiency within a certain working condition range. However, the method realizes the application to different working conditions by changing the centrifugal compressor, and the problem of limited applicable adjustment range inevitably exists.
In summary, in the prior art, for some enterprises with large capacity variation and requiring long-term continuous production, how to better set the production process without greatly changing the devices and equipment is a technical problem to be solved urgently to adjust the yield range and adapt to various working conditions occurring in the production process.
SUMMERY OF THE UTILITY MODEL
To the MVR device that uses vapor compressor (high-speed centrifugal compressor) as the core among the prior art, the utility model discloses mainly be to the stable flow range of high-speed centrifugal compressor be 65% ~ 105% characteristic, the system of the single-effect of providing through switching steam and the operating means of multiple-effect comes adjusting device output scope.
The utility model discloses a MVR system of adjustment evaporation output scope by a wide margin, it mainly includes by setting up the preheater at the feed liquid entry end, and at least 2 single effect evaporimeters establish ties and be used for concentrating the evaporimeter of feed liquid and a plurality of vapour and liquid separator that cooperate with each single effect evaporimeter respectively and use, and provide vapor compression intensification, endless vapor compressor for this system, each single effect evaporimeter is provided with steam inlet respectively; each vapor-liquid separator is provided with a vapor outlet, and the vapor compressor is provided with a vapor inlet and a vapor outlet; on the basis, a pipeline and a switching valve are additionally arranged, and the method comprises the following specific steps: a switching valve I is arranged on a steam conveying pipeline between the first steam-liquid separator and the second single-effect evaporator; a branch pipeline II is additionally arranged on a pipeline between the steam outlet of the first steam-liquid separator and the switching valve I, the other end of the branch pipeline II is communicated with a pipeline of a steam inlet of the steam compressor, and the switching valve II is arranged on the branch pipeline II; and a branch pipeline III is additionally arranged on a pipeline between the steam inlet of the second single-effect evaporator and the switching valve I, the other end of the branch pipeline III is communicated with a pipeline of the steam outlet of the steam compressor, and the switching valve III is arranged on the branch pipeline III.
For the above-mentioned technical scheme, specifically, through the setting of above-mentioned diverter valve I, diverter valve II and diverter valve III and corresponding pipeline I, pipeline II and pipeline III, can realize the interconversion of single-effect evaporation and multiple-effect evaporation to the purpose of realizing adjusting MVR device evaporation output scope is the core of this system, wherein:
when the switching valve I is opened and the switching valve II and the switching valve III are closed, the first single-effect evaporator and the second single-effect evaporator are in a series connection mode, a steam inlet of the first single-effect evaporator is communicated with a steam outlet of the steam compressor, and a steam outlet of the second steam-liquid separator is communicated with a steam inlet of the steam compressor; when the switching valve I is closed and the switching valve II and the switching valve III are opened, the first single-effect evaporator and the second single-effect evaporator are in a parallel mode, the steam outlets of the first vapor-liquid separator and the second vapor-liquid separator are respectively communicated with the steam inlet of the vapor compressor, and the steam inlets of the first single-effect evaporator and the second single-effect evaporator are respectively communicated with the steam outlet of the vapor compressor. (1) The multi-effect evaporation is characterized by at least comprising two single-effect evaporators connected in series, namely a first single-effect evaporator and a second single-effect evaporator are in a series connection mode, a steam outlet of a steam compressor is communicated with a steam inlet of the first single-effect evaporator, and a steam inlet of the steam compressor is communicated with a steam outlet of the second single-effect evaporator, namely the multi-effect series connection mode; in addition, a third single effect evaporator or more may be included. (2) The single-effect evaporation is that the first single-effect evaporator and the second single-effect evaporator are in a parallel mode, steam outlets of the first vapor-liquid separator and the second vapor-liquid separator are respectively communicated with a steam inlet of the vapor compressor, steam inlets of the first single-effect evaporator and the second single-effect evaporator are respectively communicated with a steam outlet of the vapor compressor, and in addition, a third single-effect evaporator or more single-effect evaporators can be included.
More preferably, the vapor compressor is a high-speed centrifugal compressor.
In the embodiment of the application, the evaporator is a falling film evaporator; in fact, all MVR's evaporator forms are all applicable to the utility model discloses.
Further, multi-effect evaporator in this application embodiment be comparatively the double-effect evaporator who uses often (double-effect evaporator, single-effect evaporator's quantity is 2), double-effect evaporator in:
(1) a switching valve I is arranged on a pipeline between the top steam outlet of the first steam-liquid separator (namely the first steam-liquid separator) and the top steam inlet of the second-effect evaporator (namely the second evaporator);
(2) a branch pipeline II is additionally arranged on a pipeline between a top steam outlet of the first steam-liquid separator and the switching valve I, the other end of the branch pipeline II is communicated with a pipeline of a steam inlet of the steam compressor, and the switching valve II is arranged on the branch pipeline II;
(3) a branch pipeline III is additionally arranged on a pipeline between a steam inlet of the double-effect evaporator and the switching valve I, the other end of the branch pipeline III is communicated with a pipeline of a steam outlet of the steam compressor, and the switching valve III is arranged on the branch pipeline III.
System of adjustment MVR device evaporation output scope by a wide margin, its technological method specifically as follows: the MVR system is used for realizing the interconversion of single-effect evaporation and multi-effect evaporation by controlling the opening and closing of the switching valve I, the switching valve II and the switching valve III, thereby realizing the purpose of adjusting the yield of the MVR device;
preferably, when the multi-effect evaporator is a double-effect evaporator formed by connecting 2 single-effect evaporators in series, the opening and closing modes of the switching valve I, the switching valve II and the switching valve III are controlled as follows:
when the switching valve I9 is opened and the switching valve II10 and the switching valve III11 are closed, multi-effect evaporation, namely a multi-effect series mode, is realized;
when the switching valve I9 is closed and the switching valves II10 and III11 are opened, single-effect evaporation, namely a single-effect mode of parallel connection of steam, is realized.
Further, the steam cycle process of the single-effect evaporation is as follows: the primary steam pressurized and heated by the steam compressor simultaneously enters each single-effect evaporator, different amounts of secondary steam are evaporated from the feed liquid of each single-effect evaporator, and the primary steam is condensed into water; the secondary steam is purified and separated by a steam-liquid separator matched with each single-effect evaporator respectively to evaporate tertiary steam, and the secondary steam is condensed into water; and the tertiary steam is respectively output from a steam outlet of the steam-liquid separator, is combined and then enters the steam compressor again, and the tertiary steam is pressurized and heated in the steam compressor and then enters each single-effect evaporator to complete the evaporation cycle.
Further, the steam circulation mode of the multi-effect evaporation comprises the following processes: the steam evaporated from the feed liquid in the second single-effect evaporator is separated by the second vapor-liquid separator, the steam enters the vapor compressor, and is compressed in the vapor compressor, heated and output, and returns to the first single-effect evaporator (as described above), and is used as heating steam, thus providing circulation of the steam.
Furthermore, the system is also provided with a vacuum pump for maintaining the vacuum degree of the whole system so as to achieve the stable evaporation state of the system. The system is also provided with a circulating pump for realizing the conveying of the feed liquid in the system.
The beneficial effects of the utility model are that, through the method of single effect evaporation and multiple effect evaporation interconversion adjustment MVR device output, make the stable work of vapor compressor ability under lower load, the implementation scheme under the 50% productivity operating mode has been given in specific embodiment, from this the demonstration, MVR system can effectual realization under the operating mode that the productivity descends, still can steady operation's technological effect.
Drawings
FIG. 1 is a prior art MVR dual effect evaporation apparatus;
FIG. 2 is a view of the MVR dual-effect evaporation apparatus of example 2; namely, the switching valve I9 is opened, and the switching valves II10 and III11 are closed;
FIG. 3 is a view of the MVR dual-effect evaporation apparatus of example 2; namely, the switching valve I9 is closed, and the switching valves II10 and III11 are open;
FIG. 4. MVR triple effect evaporation device of the prior art;
FIG. 5 is a MVR triple effect evaporation unit of example 3; namely, the switching valve I9 is opened, and the switching valves II10 and III11 are closed;
FIG. 6 is a MVR triple effect evaporation unit of example 3; namely, the switching valve I9 is closed, and the switching valves II10 and III11 are open;
wherein: 1 preheater, 2 one-effect evaporators, 21 one-effect evaporator bottom outlets, 22 one-effect evaporator top feed liquid inlets, 23 one-effect evaporator top steam inlets, 24 one-effect evaporator condensed water outlets, 3 one-effect vapor-liquid separators, 31 one-effect separator bottom outlets and 32 one-effect vapor-liquid separator top outlets; 4 a first-effect circulating pump, 5 a second-effect evaporator, 51 a second-effect evaporator bottom outlet, 52 a second-effect evaporator top feed liquid inlet, 53a second-effect evaporator top steam inlet, 54 a second-effect evaporator condensed water outlet, 6 a second-effect vapor-liquid separator, 61 a second-effect separator bottom outlet, 62 a second-effect vapor-liquid separator top outlet; 7 two-effect circulating pump, 8 steam compressor, 9 switching valve I, 10 switching valve II, 11 switching valve III; 12, a triple-effect evaporator; a bottom material liquid inlet of the 121 triple-effect evaporator, a top steam inlet of the 122 triple-effect evaporator, a condensed water outlet of the 123 triple-effect evaporator, a 13 triple-effect vapor-liquid separator, a bottom material liquid outlet of the 131 triple-effect vapor-liquid separator, a top steam outlet of the 132 triple-effect vapor-liquid separator and a 14 triple-effect circulating pump.
Detailed Description
The following detailed description of the present invention is provided in conjunction with the accompanying drawings, but it should be understood that the scope of the present invention is not limited by the detailed description.
Spatially relative terms, such as "lower," "below," "lower," "upper," "above," "upper," and the like, may be used herein for ease of description to describe one element or feature's relationship to another element or feature in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the object in use or operation in addition to the orientation depicted in the figures.
In this document, the terms "first", "second", etc. are used to distinguish two different elements or portions, and are not used to define a particular position or relative relationship. In other words, the terms "first," "second," and the like may also be interchanged with one another in some embodiments.
The MVR evaporation device is limited by the operation range of the compressor, generally adopts single effect and double effect, and is not commonly used in the MVR evaporation device with three or more effects; however, those skilled in the art can derive the method of the present invention from the implementation of the specific embodiment to adapt the method according to the specific implementation process, thereby being suitable for other similar multi-effect evaporation systems.
The multi-effect evaporation is the series evaporation operation of taking the secondary steam of the previous effect as the next effect to heat the steam. In multi-effect evaporation, the operating pressure, corresponding heating steam temperature and solution boiling point of each effect are sequentially reduced. The vapor compressor used in this example was a high-speed centrifugal compressor, and the evaporator was a multi-effect falling film evaporator. The system is also provided with a conventional vacuum pump for maintaining the vacuum degree of the whole system so as to achieve a stable evaporation state of the system.
Example 1
MVR evaporation plant among the prior art contains the pre-heater (being heat exchanger, can preheat the feeding), multiple-effect evaporation system, vapour and liquid separator (being steam/liquid separator, the separator plays the separation effect of liquid and gas), core equipment such as compressor and some other auxiliary assemblies, the utility model discloses the evaporation capacity who designs among the use prior art is 20t/h, adopts the two-effect MVR evaporation plant of falling film evaporator as the example, like figure 1, explains the method of adjusting MVR device total output through the relation of connection of adjustment multiple-effect evaporation system and compressor.
The dual effect mode of operation is described as follows:
(1) the raw material concentration process comprises the following steps: dilute liquid is preheated by a preheater 1 and then enters the single-effect evaporator 2 from a top liquid inlet 22 of the single-effect evaporator 2 (the mode of adding raw materials by the multi-effect evaporator can be concurrent feeding, countercurrent feeding and advection feeding), after the dilute liquid is heated and boiled in the single-effect evaporator 2, vapor-liquid separation is realized by a single-effect vapor-liquid separator 3 matched with the single-effect evaporator 2 to obtain primary concentrated liquid, the primary concentrated liquid is output from a bottom liquid outlet 31 of the single-effect separator 3 and is mixed with liquid conveyed from a bottom outlet 21 of the single-effect evaporator, and then a part of the primary concentrated liquid is conveyed to the top liquid inlet 22 of the single-effect evaporator 2 to return to the single-effect evaporator 2 for circulation through the action of a pipeline and a single-effect circulating pump 4 arranged on the pipeline, and after the other part of the primary concentrated liquid reaching the set concentration is mixed with the liquid output from a bottom outlet 61 of the double-effect separator, the top feed liquid is conveyed to a top feed liquid inlet 52 of the double-effect evaporator 5 through a pipeline; the primary concentrated feed liquid entering the secondary evaporator 5 from the top is further heated to boiling, and the vapor-liquid separator is realized by the secondary vapor-liquid separator 6 matched with the primary evaporator 2 to evaporate the other part of water, so that the secondary concentrated feed liquid is output from the outlet 61 at the bottom of the secondary vapor-liquid separator 6, mixed with the feed liquid delivered from the bottom outlet 51 of the double-effect evaporator and then delivered through a pipeline, wherein, one part of the secondary concentrated feed liquid is conveyed to the top feed liquid inlet 52 of the double-effect evaporator 5 to enter the inside of the double-effect evaporator 5 for circulation through the action of the pipeline and the double-effect circulating pump 7 arranged on the pipeline, after the other part of the secondary concentrated feed liquid reaches the set feed liquid concentration, a concentrated solution outlet of an external pipeline of the second-effect evaporator 5 leaves the system and is collected into a final concentrated solution product; that is to say, the first-effect evaporator 2 and the second-effect evaporator 5 are respectively provided with a material liquid circulation pipeline, two ends of the material liquid circulation pipeline are respectively communicated with the bottom and the top of the first-effect evaporator 2 (or the second-effect evaporator 5), and the material liquid circulation pipeline is respectively provided with a circulation pump for conveying material liquid from bottom to top.
(2) And (3) water evaporation process: the primary steam which is pressurized and heated by the steam compressor 8 enters the one-effect evaporator 2 from a steam inlet 23 at the top of the one-effect evaporator, secondary steam with the same amount is evaporated from the dilute liquid in the one-effect evaporator 2, and the primary steam is condensed into water; the secondary steam is purified and separated by the primary-effect steam-liquid separator 3 and then is conveyed from the top outlet 32 of the primary-effect steam-liquid separator 3 to the top steam inlet 53 of the secondary-effect evaporator 5; continuously evaporating another part of water with the same amount from the primary concentrated feed liquid in the double-effect evaporator 5 to form tertiary steam, condensing the secondary steam to form water, outputting the condensed water from a condensed water outlet 54 of the double-effect evaporator 5, and conveying the condensed water generated by the single-effect evaporator 2 and output from a condensed water outlet 24 of the single-effect evaporator 2 to the preheater 1 (which can fully utilize the waste heat of the condensed water) to preheat the dilute feed liquid; the tertiary steam is purified and separated by the double-effect steam-liquid separator 6, then is output from the top outlet 62 of the double-effect steam-liquid separator 6, enters the steam compressor 8 again, is pressurized and heated, and then enters the single-effect evaporator 2 from the steam inlet 23 at the top of the single-effect evaporator, so that the evaporation cycle is completed. It can be seen that the amount of steam entering the steam compressor 8 for pressurization and temperature rise is approximately the same as the amount of water evaporated in the first-effect evaporator 2 and the second-effect evaporator 5, and the total amount of water evaporated by the device is the sum of the amounts of water evaporated in the first-effect evaporator 2 and the second-effect evaporator 5, which is approximately 2 times the capacity of the steam compressor 8.
Example 2
According to the above, an MVR device with the evaporation capacity of 20t/h is designed, and the theoretical design flow of the high-speed vapor compressor is 10 t/h; if the continuous evaporation capacity of the evaporation device is required to be 10t/h, namely 50% of the design capacity, the steam flow entering the steam compressor 8 is required to be 50% of the design capacity without adjusting the existing state of the device, which exceeds the normal working range of 65% -105% of the high-speed centrifugal compressor 8, and is difficult to achieve.
To solve the above problems in the prior art; the present application adds a switching valve I9, a switching valve II10, and a switching valve III11 to embodiment 1, as shown in fig. 2, that is, the setting positions of the switching valves are respectively as follows:
(1) a switching valve I9 is arranged on a pipeline between the top steam outlet 32 of the single-effect vapor-liquid separator 3 and the top steam inlet 53 of the double-effect evaporator 5;
(2) a branch pipeline II is additionally arranged on a pipeline between the top steam outlet 32 of the single-effect gas-liquid separator 3 and the switching valve I9, the other end of the branch pipeline II is communicated with a pipeline of a steam inlet of the steam compressor 8, and the switching valve II10 is arranged on the branch pipeline II;
(3) a branch pipeline III is additionally arranged on a pipeline between the steam inlet 53 of the double-effect evaporator 5 and the switching valve I9, the other end of the branch pipeline III is communicated with a pipeline of a steam outlet of the steam compressor 8, and the branch pipeline III is provided with a switching valve III 11.
Through the arrangement of the switching valve I9, the switching valve II10, the switching valve III11 and corresponding pipelines, the interconversion of single-effect evaporation and multi-effect evaporation is realized, and the purpose of adjusting the yield of the MVR device is realized.
In fig. 2, when the switching valve I9 is opened and the switching valves II10 and III11 are closed, i.e., multi-effect evaporation (two-effect evaporation), the operation mode is exactly the same as the two-effect operation mode in the prior art described in embodiment 1.
In fig. 3, when the switching valve I9 is closed and the switching valves II10 and III11 are open, single-effect evaporation is realized, i.e. the mode is switched to a single-effect mode with parallel steam, and the single-effect operation mode is described as follows:
(1) the raw material concentration process comprises the following steps: in accordance with the procedure described in step (1) of example 1.
(2) And (3) water evaporation process: the primary steam pressurized and heated by the steam compressor 8 simultaneously enters the first-effect evaporator 2 (entering from the top steam inlet 23) and the second-effect evaporator 5 (entering from the top steam inlet 53) respectively, different amounts of secondary steam are evaporated from the feed liquid respectively, and the primary steam is condensed into water; the secondary steam is purified and separated by the first-effect steam-liquid separator 3 and the second-effect steam-liquid separator 6, then is output from the top outlet 32 of the steam-liquid separator 3 and the top outlet 62 of the steam-liquid separator 6, is combined together, enters the steam compressor 8 again, is pressurized and heated, and then enters the first-effect evaporator 2 (entering from the top steam inlet 23) and the second-effect evaporator 5 (entering from the top steam inlet 53) to complete the evaporation cycle. The total amount of the water evaporated by the device is the sum of the water evaporated in the first-effect evaporator 2 and the second-effect evaporator 5, and is the same as the amount of the steam entering the steam compressor 8 for pressurization and temperature rise.
Under the working condition, the MVR device with the designed evaporation capacity of 20t/h has the total evaporation capacity of 10t/h under the working condition of 50% capacity, the flow rate entering the vapor compressor 8 is the same as the total evaporation capacity, and the MVR device can normally work within the normal operation range of 65% -105% of the high-speed vapor compressor.
Example 3
The MVR device is designed, and the existing three-effect flow is shown in fig. 4, which is equivalent to that a three-effect evaporator is added on the basis of the example 1 in which the first effect and the second effect are connected in series, and the three-effect vapor-liquid separator 13 is connected with the three-effect evaporator 12, that is: the top steam inlet 122 of the triple effect evaporator is connected with the steam outlet of the steam compressor 8; the steam outlet 132 at the top of the three-effect steam-liquid separator is connected with the steam inlet of the steam compressor 8; the feed liquid of the bottom feed liquid inlet 121 of the triple-effect evaporator is feed liquid circulating from the bottom outlet of the double-effect evaporator, and the feed liquid is conveyed by a triple-effect circulating pump 14 and provided with an outlet for collecting concentrated liquid from a pipeline. The feed liquid inlet 131 at the bottom of the triple-effect separator is conveyed by the circulating pump 14, the feed liquid is conveyed to the concentrated liquid outlet, one part of the feed liquid is collected, the other part of the feed liquid is mixed with the feed liquid circulating from the bottom outlet of the double-effect evaporator and then enters the triple-effect evaporator, and a condensed water outlet 123 of the triple-effect evaporator and a condensed water outlet 54 of the double-effect evaporator are converged and heat is exchanged through the heat exchanger 1 to be output as condensed water.
The positions of the switching valve I9, the switching valve II10 and the switching valve III11 which are additionally arranged are shown in fig. 5 and 6, namely the arrangement positions of the switching valves are respectively as follows:
(1) a switching valve I9 is arranged on a pipeline between the top steam outlet 32 of the single-effect vapor-liquid separator 3 and the top steam inlet 53 of the double-effect evaporator 5;
(2) a branch pipeline II is additionally arranged on a pipeline between the top steam outlet 32 of the single-effect gas-liquid separator 3 and the switching valve I9, the other end of the branch pipeline II is communicated with a pipeline of a steam inlet of the steam compressor 8, and the switching valve II10 is arranged on the branch pipeline II;
(3) a branch pipeline III is additionally arranged on a pipeline between the steam inlet 53 of the double-effect evaporator 5 and the switching valve I9, the other end of the branch pipeline III is communicated with a pipeline of a steam outlet of the steam compressor 8, and the branch pipeline III is provided with a switching valve III 11.
Through the arrangement of the switching valve I9, the switching valve II10, the switching valve III11 and corresponding pipelines, the interconversion of single-effect evaporation and multi-effect evaporation is realized, and the purpose of adjusting the yield of the MVR device is realized.
In fig. 5, when the switching valve I9 is opened and the switching valves II10 and III11 are closed, the operation mode is substantially the same as that described in fig. 4.
In fig. 6, when the switching valve I9 is closed and the switching valves II10 and III11 are open, the switching modes are as follows:
and (3) an evaporation process: the primary steam pressurized and heated by the steam compressor 8 simultaneously enters the first-effect evaporator 2 (entering from the top steam inlet 23), the second-effect evaporator 5 (entering from the top steam inlet 53) and the third-effect evaporator 12 (entering from the top steam inlet 122) respectively, different amounts of secondary steam are evaporated from the feed liquid respectively, and the primary steam is condensed into water; the secondary steam is purified and separated by the first-effect steam-liquid separator 3, the second-effect steam-liquid separator 6 and the third-effect steam-liquid separator 13, and then is output and combined together by the top outlet 32 of the first-effect steam-liquid separator 3, the top outlet 62 of the second-effect steam-liquid separator 6 and the top outlet 132 of the third-effect steam-liquid separator, and then enters the steam compressor 8 for pressurization and temperature rise, and then enters the first-effect evaporator 2 (entering from the top steam inlet 23), the second-effect evaporator 5 (entering from the top steam inlet 53) and the third-effect evaporator 12 (entering from the top steam inlet 122), so that the evaporation cycle is completed.
In a word, the adopted three-effect flow is formed by additionally arranging a pipeline and a switching valve on the basis of the existing flow mode applied in the prior art; wherein, the material is evaporated and concentrated for three times, the added third effect is connected in series after the second effect, the first steam is always used, and the flow is relatively independent; the steam switching in the process is only limited to one effect and two effects.
The above disclosure is only for the best mode of the invention and should not be construed as limiting the scope of the invention, and all or part of the processes of the above embodiments and derivatives thereof based on the claims are not limited to the embodiments shown, and equivalents thereof may be made by those skilled in the art without departing from the scope of the invention.
Claims (5)
1. An MVR system for substantially adjusting the range of evaporation output, the system comprising a preheater, and at least 2 single effect evaporators connected in series, and a vapor-liquid separator cooperating with each single effect evaporator, respectively, and a vapor compressor providing vapor circulation for the system, each single effect evaporator having a vapor inlet, each vapor-liquid separator having a vapor outlet, the vapor compressor having a vapor inlet and a vapor outlet, the MVR system characterized in that: a switching valve I is arranged on a steam conveying pipeline between the first steam-liquid separator and the second single-effect evaporator; a branch pipeline II is additionally arranged on a pipeline between the steam outlet of the first steam-liquid separator and the switching valve I, the other end of the branch pipeline II is communicated with a pipeline of a steam inlet of the steam compressor, and the switching valve II is arranged on the branch pipeline II; and a branch pipeline III is additionally arranged on a pipeline between the steam inlet of the second single-effect evaporator and the switching valve I, the other end of the branch pipeline III is communicated with a pipeline of the steam outlet of the steam compressor, and the switching valve III is arranged on the branch pipeline III.
2. The MVR system of claim 1, wherein: when the switching valve I is opened and the switching valve II and the switching valve III are closed, the first single-effect evaporator and the second single-effect evaporator are in a series connection mode, a steam inlet of the first single-effect evaporator is communicated with a steam outlet of the steam compressor, and a steam outlet of the second steam-liquid separator is communicated with a steam inlet of the steam compressor; when the switching valve I is closed and the switching valve II and the switching valve III are opened, the first single-effect evaporator and the second single-effect evaporator are in a parallel mode, the steam outlets of the first vapor-liquid separator and the second vapor-liquid separator are respectively communicated with the steam inlet of the vapor compressor, and the steam inlets of the first single-effect evaporator and the second single-effect evaporator are respectively communicated with the steam outlet of the vapor compressor.
3. The MVR system of claim 1, wherein the vapor compressor is a high-speed centrifugal compressor.
4. The MVR system of claim 1, wherein the single effect evaporator is a falling film evaporator.
5. The MVR system of claim 1, wherein when the number of single-effect evaporators is 2:
(1) a switching valve I is arranged on a pipeline between a steam outlet of the first steam-liquid separator and a steam inlet of the second single-effect evaporator;
(2) a branch pipeline II is additionally arranged on a pipeline between the steam outlet of the first steam-liquid separator and the switching valve I, the other end of the branch pipeline II is communicated with a pipeline of a steam inlet of the steam compressor, and the switching valve II is arranged on the branch pipeline II;
(3) a branch pipeline III is additionally arranged on a pipeline between a steam inlet of the second single-effect evaporator and the switching valve I, the other end of the branch pipeline III is communicated with a pipeline of a steam outlet of the steam compressor, and the switching valve III is arranged on the branch pipeline III;
(4) when the switching valve I is opened, the switching valve II and the switching valve III11 are closed, namely multi-effect evaporation is carried out; when the switching valve I is closed, the switching valve II and the switching valve III are opened, and single-effect evaporation is realized.
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| CN110538474A (en) * | 2019-10-08 | 2019-12-06 | 大连海新工程技术有限公司 | MVR system capable of greatly adjusting evaporation yield range and technological method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110538474A (en) * | 2019-10-08 | 2019-12-06 | 大连海新工程技术有限公司 | MVR system capable of greatly adjusting evaporation yield range and technological method thereof |
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