CN114229936B - Ammonia water MVR stripping system and stripping method thereof - Google Patents
Ammonia water MVR stripping system and stripping method thereof Download PDFInfo
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- CN114229936B CN114229936B CN202111541320.4A CN202111541320A CN114229936B CN 114229936 B CN114229936 B CN 114229936B CN 202111541320 A CN202111541320 A CN 202111541320A CN 114229936 B CN114229936 B CN 114229936B
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- 238000000034 method Methods 0.000 title claims abstract description 15
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 title claims description 28
- 235000011114 ammonium hydroxide Nutrition 0.000 title claims description 28
- 239000011552 falling film Substances 0.000 claims abstract description 106
- 238000001704 evaporation Methods 0.000 claims abstract description 99
- 230000008020 evaporation Effects 0.000 claims abstract description 82
- 239000007788 liquid Substances 0.000 claims abstract description 79
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 58
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 26
- 239000000463 material Substances 0.000 claims abstract description 10
- 238000010438 heat treatment Methods 0.000 claims description 10
- 239000002351 wastewater Substances 0.000 claims description 10
- 230000008569 process Effects 0.000 claims description 4
- 238000003825 pressing Methods 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 3
- 239000000126 substance Substances 0.000 abstract description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 19
- 239000007789 gas Substances 0.000 description 6
- 230000008016 vaporization Effects 0.000 description 6
- 238000009834 vaporization Methods 0.000 description 5
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 4
- 230000009467 reduction Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 239000002918 waste heat Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 230000009615 deamination Effects 0.000 description 1
- 238000006481 deamination reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/08—Thin film evaporation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
Abstract
The invention relates to the technical field of chemical equipment, in particular to an ammonia MVR stripping system and a stripping method thereof, wherein the ammonia MVR stripping system comprises a rectifying tower, a first vapor compressor and a falling film evaporator, a feed inlet of the rectifying tower is communicated with equipment for conveying materials from outside, an air inlet of the rectifying tower is communicated with equipment for conveying steam from outside, the falling film evaporator comprises a falling film heat exchanger and a falling film evaporation chamber, a tube pass of the falling film heat exchanger is communicated with the falling film evaporation chamber, a liquid outlet of the rectifying tower is communicated with the tube pass of the falling film heat exchanger, two ends of an upper tube pass of the falling film heat exchanger are communicated through a pipeline and are provided with a circulating conveying pump for circulating and conveying liquid in the tube pass, and the first evaporation chamber and the second vapor compressor are arranged between a liquid outlet at the bottom of the upper tube pass of the falling film heat exchanger and the air inlet of the falling film evaporator, so that the liquid in the falling film heat exchanger is heated and gasified by the first evaporation chamber, and then the gasified steam is conveyed to the second vapor compressor to be compressed to the temperature required by the falling film evaporator.
Description
Technical Field
The invention relates to the technical field of chemical equipment, in particular to an ammonia MVR stripping system and a stripping method thereof.
Background
In industrial production, a large amount of wastewater containing ammonia nitrogen is often generated, and the waste of resources is serious due to high cost for treating the wastewater containing ammonia nitrogen.
The traditional technology for generating the wastewater containing ammonia nitrogen in the treatment industry adopts a relatively mature and widely applied technology, namely a method for deaminizing by steam stripping rectification, namely, the wastewater containing ammonia nitrogen is subjected to steam stripping in a steam stripping deamination tower, and then is subjected to rectification in a rectifying section to produce ammonia water with a certain concentration. The existing equipment consumes a large amount of steam in the steam stripping process, and the falling film heat exchanger is continuously provided with water, and redundant water with higher temperature is directly discharged, so that the consumption of steam is required to be increased, and the consumption of energy is increased.
Disclosure of Invention
The invention aims to solve the technical problems that: in order to solve the problems that the prior equipment consumes a large amount of steam in the steam stripping process, and the evaporator generates water with higher temperature to be directly discharged, the consumption of steam is required to be increased, and the consumption of energy is increased, the ammonia MVR steam stripping system and the steam stripping method thereof are provided.
The technical scheme adopted for solving the technical problems is as follows: the utility model provides an aqueous ammonia MVR stripping system, includes rectifying column, first vapor compressor and falling film evaporator, the feed inlet and the outside equipment intercommunication that carries the material of rectifying column, the air inlet and the outside equipment intercommunication that carries steam of rectifying column, falling film evaporator includes falling film heat exchanger and falling film evaporation chamber, falling film heat exchanger's tube side and falling film evaporation chamber intercommunication, the liquid outlet and the tube side intercommunication of falling film heat exchanger of rectifying column, the both ends of tube side are passed through the pipeline intercommunication and are provided with the circulating delivery pump that is used for carrying out circulating delivery with the liquid in the tube side on the falling film heat exchanger, falling film evaporation chamber's gas outlet and first vapor compressor's gas inlet intercommunication, the gas outlet and the air inlet intercommunication of rectifying column of falling film heat exchanger upper shell side, falling film heat exchanger upper shell side's gas outlet and outside equipment intercommunication, falling film heat exchanger upper shell side's liquid outlet and rectifying column's feed inlet intercommunication.
According to the invention, the falling film evaporation chamber is used for respectively evaporating part of ammonia water vapor at the air outlet of the rectifying tower and the ammonia water condensed at the bottom of the rectifying tower again, and the evaporated vapor is compressed again through the first vapor compressor and is conveyed to the air inlet of the rectifying tower for recycling, so that the use of primary vapor is reduced, the low-concentration ammonia water with waste heat in the rectifying tower is better utilized, the energy utilization rate is improved, and the purposes of energy conservation and emission reduction are achieved.
Further, a first evaporation chamber and a second vapor compressor are communicated between the bottom of the falling film heat exchanger and the falling film evaporator, a liquid outlet at the bottom of the falling film heat exchanger is communicated with a liquid inlet of the first evaporation chamber, an air outlet of the first evaporation chamber is communicated with an air inlet of the second vapor compressor, and an air outlet of the second vapor compressor is communicated with an air inlet of the falling film evaporation chamber. Through set up first evaporating chamber and second vapor compressor between falling film heat exchanger upper tube side bottom liquid outlet and falling film evaporator's air inlet, first evaporating chamber has certain stable liquid heating and vaporization in with the falling film heat exchanger, can utilize the unnecessary water that has the temperature of falling film heat exchanger to provide a part steam for the falling film evaporator again like this, can improve the use amount of secondary steam like this, and reduce the use of primary steam, better utilization falling film heat exchanger has preheated water, the improvement energy utilization, reach energy saving and emission reduction.
In order to better utilize the hot water with residual temperature discharged by the first evaporation chamber, further, a second evaporation chamber and a third vapor compressor are communicated between a liquid outlet of the first evaporation chamber and an air inlet of the first evaporation chamber, a liquid outlet of the bottom of the first evaporation chamber is communicated with a liquid inlet of the second evaporation chamber, an air outlet of the second evaporation chamber is communicated with an air inlet of the third vapor compressor, and an air outlet of the third vapor compressor is communicated with the air inlet of the first evaporation chamber. And the hot water with the residual temperature in the first evaporation chamber is heated and evaporated through the second evaporation chamber, the evaporated steam is compressed to the temperature required by the first evaporation chamber through the third vapor compressor, the hot water with the residual temperature is recycled for multiple times, and the energy consumption is reduced.
In order to ensure that the hot water with residual temperature in the falling film heat exchanger enters the first evaporation chamber and the second evaporation chamber, a vacuum pump is further connected between the second evaporation chamber and the third vapor compressor. Through carrying out the evacuation to the pipeline, make pipeline both ends form pressure differential like this to make in the pipeline hot water can flow from one end to the other end through pressure differential, guarantee to have surplus warm hot water by the circulation use reliable and stable.
Further, an ammonia water tank is communicated between a feed inlet of the rectifying tower and a shell side liquid outlet of the falling film heat exchanger.
An ammonia MVR stripping method comprises the following steps:
s1, delivering wastewater containing ammonia into a rectifying tower through a feed inlet, simultaneously delivering primary fresh steam into the rectifying tower, separating gas from liquid by the rectifying tower after heat exchange, delivering liquid into a tube side of a falling film heat exchanger, circularly delivering the liquid in the falling film heat exchanger by a circulating delivery pump, delivering the steam into a shell side of the falling film heat exchanger and exchanging heat with the liquid circularly delivered in the tube side, collecting the steam with required concentration after heat exchange through a pipeline and external material equipment, delivering the liquid with ammonia into an ammonia water tank after condensation, and delivering the liquid into the feed inlet of the rectifying tower for circular separation again by the ammonia water tank;
s2, a part of liquid in the upper tube side of the falling film heat exchanger enters a falling film evaporation chamber to be heated and evaporated, and the evaporated steam is conveyed into a rectifying tower through a first steam compressor to be reused;
and S3, pressing part of liquid in the falling film heat exchanger into the first evaporation chamber by a vacuum pump to heat and evaporate, compressing the evaporated steam to a required temperature by a second vapor compressor, and conveying the compressed steam into the falling film evaporation chamber.
In the step S3, the liquid vaporized in the first evaporating chamber is heated and vaporized again through the second evaporating chamber, and the vaporized vapor is compressed to the vapor with the required temperature through the third vapor compressor and is conveyed into the first evaporating chamber for heating and vaporizing again.
The beneficial effects of the invention are as follows: when the ammonia water MVR stripping system and the stripping method thereof are used, part of ammonia water vapor at the air outlet of the rectifying tower and condensed ammonia water at the bottom of the rectifying tower are respectively evaporated through the falling film evaporation chamber, the evaporated vapor is compressed again through the first vapor compressor and is conveyed to the air inlet of the rectifying tower for recycling, so that the use of primary vapor is reduced, low-concentration ammonia water with waste heat in the rectifying tower is better utilized, the energy utilization rate is improved, the energy conservation and emission reduction are achieved, a large amount of vapor is avoided in the stripping process of the existing equipment, and the evaporator generates high-temperature water to be directly discharged, so that the consumption of the vapor is required to be increased, and the problem of energy consumption is increased.
Drawings
The invention will be further described with reference to the drawings and examples.
Fig. 1 is a schematic diagram of the present invention.
In the figure: 1. rectifying column, 2, first vapor compressor, 3, falling film evaporator, 4, first evaporating chamber, 5, second vapor compressor, 6, second evaporating chamber, 7, third vapor compressor, 8, vacuum pump, 9, aqueous ammonia jar, 10, falling film heat exchanger, 11, falling film evaporating chamber, 12, circulating delivery pump.
Detailed Description
The invention is further described in detail below in connection with the examples:
the present invention is not limited to the following embodiments, and those skilled in the art can implement the present invention in various other embodiments according to the present invention, or simply change or modify the design structure and thought of the present invention, which fall within the protection scope of the present invention. It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art in a specific case.
As shown in fig. 1, an ammonia MVR stripping system comprises a rectifying tower 1, a first vapor compressor 2 and a falling film evaporator 3, wherein a feed inlet of the rectifying tower 1 is communicated with equipment for conveying materials from outside, an air inlet of the rectifying tower 1 is communicated with equipment for conveying steam from outside, the falling film evaporator 3 comprises a falling film heat exchanger 10 and a falling film evaporation chamber 11, a tube pass of the falling film heat exchanger 10 is communicated with the falling film evaporation chamber 11, a liquid outlet of the rectifying tower 1 is communicated with the tube pass of the falling film heat exchanger 10 through a pump, two ends of the tube pass of the falling film heat exchanger 10 are communicated through a pipeline and are provided with a circulating conveying pump 12 for circulating and conveying liquid in the tube pass, an air outlet of the falling film evaporation chamber 11 is communicated with an air inlet of the first vapor compressor 2, an air outlet of the first vapor compressor 2 is communicated with an air inlet of the rectifying tower 1, an air outlet of the rectifying tower 1 is communicated with an air inlet of a shell pass of the falling film heat exchanger 10, and an air outlet of the falling film heat exchanger 10 is communicated with the feed inlet of the falling film heat exchanger 10.
The first evaporation chamber 4 and the second vapor compressor 5 are communicated between the bottom of the falling film heat exchanger 10 and the falling film evaporator 3, a liquid outlet at the bottom of the falling film heat exchanger 10 is communicated with a liquid inlet of the first evaporation chamber 4, an air outlet of the first evaporation chamber 4 is communicated with an air inlet of the second vapor compressor 5, and an air outlet of the second vapor compressor 5 is communicated with an air inlet of the falling film evaporation chamber 11.
The liquid outlet of the first evaporation chamber 4 is communicated with the air inlet of the first evaporation chamber 4, a second evaporation chamber 6 and a third vapor compressor 7 are communicated with the liquid inlet of the second evaporation chamber 6, the liquid outlet of the bottom of the first evaporation chamber 4 is communicated with the liquid inlet of the second evaporation chamber 6, the air outlet of the second evaporation chamber 6 is communicated with the air inlet of the third vapor compressor 7, the air outlet of the third vapor compressor 7 is communicated with the air inlet of the first evaporation chamber 4, and the liquid outlet of the second evaporation chamber 6 is connected with a pump.
A vacuum pump 8 is connected between the second evaporation chamber 6 and the third vapor compressor 7.
An ammonia tank 9 is communicated between the feed inlet of the rectifying tower 1 and the shell side liquid outlet of the falling film heat exchanger 10, and a pump is arranged between the ammonia tank 9 and the rectifying tower 1.
An ammonia MVR stripping method comprises the following steps:
s1, delivering wastewater containing ammonia into a rectifying tower 1 through a feed inlet, simultaneously delivering primary fresh steam into the rectifying tower 1, separating gas from liquid by the rectifying tower 1 after heat exchange, delivering liquid to a tube side of a falling film heat exchanger 10, circularly delivering the liquid in the falling film heat exchanger 10 by a circulating delivery pump 12, delivering steam into a shell side of the falling film heat exchanger 10 and exchanging heat with the liquid circularly delivered in the tube side, collecting the steam with required concentration after heat exchange through a pipeline and communicating with external material equipment, delivering the condensed liquid with ammonia into an ammonia water tank 9, and delivering the liquid into the feed inlet of the rectifying tower 1 by the ammonia water tank 9 for further circular separation;
s2, a part of liquid in the upper tube side of the falling film heat exchanger 10 enters a falling film evaporation chamber 11 for heating and evaporation, and the evaporated steam is conveyed into a rectifying tower 1 through a first steam compressor 2 for reuse;
and S3, pressing part of liquid in the falling film heat exchanger 10 into the first evaporation chamber 4 by the vacuum pump 8 for heating and evaporation, compressing the evaporated steam to a required temperature by the second vapor compressor 5, and conveying the compressed steam into the falling film evaporation chamber 11.
In step S3, the liquid vaporized in the first vaporization chamber 4 is heated and vaporized again in the second vaporization chamber 6, and the vaporized vapor is compressed to the vapor with the required temperature by the third vapor compressor 7 and is conveyed into the first vaporization chamber 4 for heating and vaporization again.
When the ammonia water MVR stripping system and the stripping method thereof are used, an external material conveying device conveys ammonia-containing wastewater into the rectifying tower 1 through a feed inlet, wherein the concentration of ammonia water in the wastewater is 2 percent and the temperature is 90 ℃, meanwhile, external primary fresh steam is conveyed into the rectifying tower 1 through an air inlet by the external device, the temperature of the primary fresh steam is 106 ℃, the primary fresh steam exchanges heat with the ammonia-containing wastewater, ammonia is separated into steam, liquid with a certain temperature is separated from the bottom of the rectifying tower 1, because the rectifying tower 1 is at high temperature and high pressure, the liquid is 8ppm ammonia water and the temperature is 106 ℃, the liquid is conveyed to the tube side of the falling film heat exchanger 10 through a conveying pump, the tube side of the falling film heat exchanger 10 circularly conveys liquid in the falling film heat exchanger 10 through a circulating conveying pump 12, wherein the temperature of the ammonia-containing steam at the air outlet of the rectifying tower 1 is 94.9 ℃, the temperature of the circularly conveyed liquid in the shell side is 106 ℃, the ammonia-containing steam at the air outlet of the rectifying tower 1 enters the shell side of the falling film heat exchanger 10 to exchange heat with the circularly conveyed liquid in the tube side, the ammonia-containing steam with the concentration of 26.1% and the temperature of 92 ℃ is obtained, the steam with the required concentration is communicated with external material equipment through a pipeline, the condensed liquid with the ammonia of 2.46% enters an ammonia water tank 9 through a liquid outlet at the bottom of the shell side on the falling film heat exchanger 10, and the ammonia water tank 9 conveys the ammonia-containing liquid into a feed inlet of the rectifying tower 1 again and separates the ammonia-containing liquid;
the liquid with the temperature of 90 ℃ in the upper tube side of the falling film heat exchanger 10 enters the falling film evaporation chamber 11 for heating evaporation, the evaporated vapor enters the first vapor compressor 2 to compress the vapor to the temperature of 106 ℃ and enters the rectifying tower 1 for reuse, the liquid with the temperature of 90 ℃ in the falling film heat exchanger 10 is pressed into the first evaporation chamber 4 by the vacuum pump 8 for heating evaporation, the first evaporation chamber 4 converts the liquid with the temperature of 90 ℃ into the vapor and the liquid with the temperature of 76 ℃, the second vapor compressor 5 compresses the vapor with the temperature of 76 ℃ into the vapor with the temperature of 90 ℃ and conveys the vapor into the falling film evaporation chamber 11, the temperature of the liquid discharged at the moment is lower than that of the liquid discharged from the falling film heat exchanger 10, the temperature of the liquid discharged at the moment is 76 ℃ in the first evaporation chamber 4, the second evaporation chamber 6 heats the liquid with the temperature of 76 ℃ again, the liquid with the temperature of 76 ℃ is converted into the vapor and the liquid with the temperature of 62 ℃ by the vacuum pump 8, the vapor after the vapor is compressed into the vapor with the temperature of 76 ℃ by the third vapor compressor 7 and conveyed into the first evaporation chamber 4, the water pressure is reduced by the vacuum pump 6, the water pressure is reduced by the second evaporation pump 10, the water pressure is reduced by the second evaporation effect is reduced, and the water pressure is discharged by the first evaporation chamber is reduced by the second evaporation pump 10, and the water pressure is reduced by the second evaporation effect is reduced, and the water is discharged by the water pressure is discharged by the second vapor and the vapor is discharged by the vapor.
The above-described preferred embodiments according to the present invention are intended to suggest that, from the above description, various changes and modifications can be made by the worker in question without departing from the technical spirit of the present invention. The technical scope of the present invention is not limited to the description, but must be determined according to the scope of claims.
Claims (5)
1. An aqueous ammonia MVR stripping system, characterized in that: the device comprises a rectifying tower (1), a first vapor compressor (2) and a falling film evaporator (3), wherein a feed inlet of the rectifying tower (1) is communicated with equipment for conveying materials from outside, an air inlet of the rectifying tower (1) is communicated with equipment for conveying steam from outside, the falling film evaporator (3) comprises a falling film heat exchanger (10) and a falling film evaporation chamber (11), a tube pass of the falling film heat exchanger (10) is communicated with the falling film evaporation chamber (11), a liquid outlet of the rectifying tower (1) is communicated with a tube pass of the falling film heat exchanger (10), two ends of the tube pass of the falling film heat exchanger (10) are communicated through pipelines and are provided with a circulating conveying pump (12) for circulating and conveying liquid in the tube pass, an air outlet of the falling film evaporation chamber (11) is communicated with the air inlet of the first vapor compressor (2), an air outlet of the first vapor compressor (2) is communicated with the air inlet of the rectifying tower (1), an air outlet of the rectifying tower (1) is communicated with the air inlet of the falling film heat exchanger (10), and a shell pass of the rectifying tower (1) is communicated with the material outlet of the falling film heat exchanger (10);
a first evaporation chamber (4) and a second vapor compressor (5) are communicated between the bottom of the falling film heat exchanger (10) and the falling film evaporator (3), a liquid outlet at the bottom of the falling film heat exchanger (10) is communicated with a liquid inlet of the first evaporation chamber (4), an air outlet of the first evaporation chamber (4) is communicated with an air inlet of the second vapor compressor (5), and an air outlet of the second vapor compressor (5) is communicated with an air inlet of the falling film evaporation chamber (11);
an ammonia tank (9) is communicated between a feed inlet of the rectifying tower (1) and a shell side liquid outlet of the falling film heat exchanger (10).
2. The aqueous ammonia MVR stripping system of claim 1, wherein: the liquid outlet of first evaporating chamber (4) with communicate between the air inlet of first evaporating chamber (4) has second evaporating chamber (6) and third vapor compressor (7), the liquid outlet of first evaporating chamber (4) bottom communicates with the inlet of second evaporating chamber (6), the gas outlet of second evaporating chamber (6) communicates with the air inlet of third vapor compressor (7), the gas outlet of third vapor compressor (7) communicates with the air inlet of first evaporating chamber (4).
3. The aqueous ammonia MVR stripping system of claim 2, wherein: a vacuum pump (8) is connected between the second evaporation chamber (6) and the third vapor compressor (7).
4. An ammonia MVR stripping method is characterized by comprising the following steps:
s1, conveying wastewater containing ammonia into a rectifying tower (1) through a feed inlet, conveying fresh steam to the rectifying tower (1) once at the same time, separating gas from liquid by the rectifying tower (1) after heat exchange, conveying liquid to a tube side of a falling film heat exchanger (10), circularly conveying the liquid in the falling film heat exchanger (10) by a circulating conveying pump (12), enabling the steam to enter a shell side of the falling film heat exchanger (10) and exchange heat with the liquid circularly conveyed in the tube side, collecting the steam with required concentration through a pipeline and communicating with external material equipment after heat exchange, conveying the condensed liquid with ammonia into an ammonia water tank (9), and conveying the liquid into the feed inlet of the rectifying tower (1) by the ammonia water tank (9) for circular separation again;
s2, a part of liquid in the upper tube side of the falling film heat exchanger (10) enters a falling film evaporation chamber (11) for heating and evaporation, and the evaporated steam is conveyed into a rectifying tower (1) through a first steam compressor (2) for reuse;
s3, pressing part of liquid in the falling film heat exchanger (10) into the first evaporation chamber (4) by a vacuum pump (8) for heating and evaporation, compressing the evaporated steam to a required temperature by a second vapor compressor (5), and conveying the compressed steam into the falling film evaporation chamber (11).
5. The aqueous ammonia MVR stripping process of claim 4, characterized in that: in the step S3, the liquid evaporated in the first evaporation chamber (4) is heated and evaporated again through the second evaporation chamber (6), and the evaporated steam is compressed to the steam with the required temperature through the third steam compressor (7) and is conveyed into the first evaporation chamber (4) for heating and evaporating again.
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| CN202111541320.4A CN114229936B (en) | 2021-12-16 | 2021-12-16 | Ammonia water MVR stripping system and stripping method thereof |
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| CN202111541320.4A CN114229936B (en) | 2021-12-16 | 2021-12-16 | Ammonia water MVR stripping system and stripping method thereof |
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| CN114229936B true CN114229936B (en) | 2023-11-28 |
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| CN116768305A (en) * | 2023-07-06 | 2023-09-19 | 江苏瑞升华能源科技有限公司 | Wastewater deamination treatment process and device based on falling film MVR rectification technology |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN207877495U (en) * | 2018-01-12 | 2018-09-18 | 宜宾光原锂电材料有限公司 | A kind of positive ternary precursor wastewater treatment equipment of lithium electricity |
| CN109134405A (en) * | 2018-07-27 | 2019-01-04 | 深圳市瑞升华科技股份有限公司 | A kind of waste heat recovery apparatus and technique using MVR technology |
| CA3129299A1 (en) * | 2019-02-28 | 2020-09-03 | Saipem S.P.A. | Biocatalyst-based co2 stripping techniques and related systems |
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- 2021-12-16 CN CN202111541320.4A patent/CN114229936B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN207877495U (en) * | 2018-01-12 | 2018-09-18 | 宜宾光原锂电材料有限公司 | A kind of positive ternary precursor wastewater treatment equipment of lithium electricity |
| CN109134405A (en) * | 2018-07-27 | 2019-01-04 | 深圳市瑞升华科技股份有限公司 | A kind of waste heat recovery apparatus and technique using MVR technology |
| CA3129299A1 (en) * | 2019-02-28 | 2020-09-03 | Saipem S.P.A. | Biocatalyst-based co2 stripping techniques and related systems |
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