CN218392283U - Multiple-effect countercurrent falling film evaporation system for ionic membrane caustic soda - Google Patents
Multiple-effect countercurrent falling film evaporation system for ionic membrane caustic soda Download PDFInfo
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- CN218392283U CN218392283U CN202221818746.XU CN202221818746U CN218392283U CN 218392283 U CN218392283 U CN 218392283U CN 202221818746 U CN202221818746 U CN 202221818746U CN 218392283 U CN218392283 U CN 218392283U
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Abstract
The utility model discloses a multiple-effect countercurrent falling film evaporation system of ionic membrane caustic soda belongs to ionic membrane process caustic soda evaporation concentration technical field, falling film evaporator including N series connection intercommunication, falling film evaporator divide into one-effect falling film evaporator according to the order that produces alkali lye concentration by high to low in proper order, \8230, N effect falling film evaporator, N is greater than or equal to 3, and is adjacent be connected with alkali lye waste heat utilization ware and the live steam waste heat utilization ware that are used for heating alkali lye between the falling film evaporator, the medium flow direction in alkali lye waste heat utilization ware and the live steam waste heat utilization ware with alkali lye flow opposite direction in the falling film evaporator. The flow direction of the medium in the alkali liquor waste heat utilization device and the steam generation waste heat utilization device is opposite to the flow direction of the alkali liquor in the falling film evaporator, so that the alkali liquor can be fully preheated, and the alkali liquor can be conveniently concentrated.
Description
Technical Field
The utility model belongs to the technical field of ionic membrane method caustic soda evaporation concentration, concretely relates to multiple-effect countercurrent falling film evaporation system of ionic membrane caustic soda.
Background
The evaporation of the caustic soda solution refers to a technique or a process flow for increasing the concentration of the caustic soda solution by indirectly heating the caustic soda solution by using a heat source (generally steam) to partially vaporize moisture in the caustic soda solution. The weight fraction of the caustic soda produced by the ionic membrane caustic soda electrolysis process is about 32%, and the alkali liquor is usually required to be evaporated and concentrated to 50% in order to reduce the transportation cost or meet the requirements of downstream users.
The technical routes of alkali liquor evaporation mainly comprise two technical routes, namely a two-effect countercurrent evaporation technology and a three-effect countercurrent process, wherein the energy consumption of the two-effect countercurrent evaporation technology is 720-750 kg of steam per ton of total alkali; the energy consumption of the triple-effect countercurrent process is 500-530kg of steam/ton of caustic soda.
The caustic soda evaporation is a high-energy-consumption chemical process, taking a 30-ten-thousand-ton/year caustic soda device as an example, the steam consumption of an evaporation unit is 15-22 ten thousand tons, the standard coal is 2-3 ten thousand tons/year, and the generated carbon is discharged by 4-6 ten thousand tons/year. The capacity of a Chinese caustic soda plant (without potash) is about 4600 ten thousand tons/year, an alkali liquor evaporation unit is required to be configured according to about 30 percent of the caustic soda capacity, the standard coal is consumed by the evaporation unit in the Chinese caustic soda industry by about 90 to 120 ten thousand tons each year, and carbon dioxide emission of about 180 to 240 ten thousand tons is generated.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a multiple effect falling film evaporation system against current of ionic membrane caustic soda solves among the prior art caustic soda mill running cost height, and the energy consumption is high, the big technical problem that waits of carbon emission.
The utility model discloses a multiple effect is falling film evaporation system against current of ionic membrane caustic soda, including the falling film evaporator of a N series connection intercommunication, falling film evaporator divide into one-effect falling film evaporator according to the order that generates alkali lye concentration by height to low in proper order, \8230, N effect falling film evaporator, N is greater than or equal to 3, and is adjacent be connected with alkali lye waste heat utilization ware and the steam generation waste heat utilization ware that are used for heating alkali lye between the falling film evaporator, medium flow direction in alkali lye waste heat utilization ware and the steam generation waste heat utilization ware with alkali lye flow opposite direction in the falling film evaporator.
The working principle is as follows: when the alkali liquor preheating device is used, low-concentration alkali liquor enters from the N-effect falling-film evaporator and flows to the one-effect falling-film evaporator, high-concentration alkali liquor and steam-generating condensate discharged by the one-effect falling-film evaporator are preheated by the alkali liquor waste heat utilization device and the steam-generating waste heat utilization device respectively, the preheated alkali liquor enters the one-effect falling-film evaporator again, and the subsequent working flow of the falling-film evaporator is the same as that of the one-effect falling-film evaporator. Through setting up alkali lye waste heat utilization ware and raw steam waste heat utilization ware, can reduce the use of raw steam with the heat of alkali lye and raw steam condensate, practice thrift the energy consumption to reduce carbon and discharge. The flow direction of the medium in the alkali liquor waste heat utilization device and the steam generation waste heat utilization device is opposite to the flow direction of the alkali liquor in the falling film evaporator, so that the alkali liquor can be fully preheated, and the alkali liquor can be conveniently concentrated.
Further, N in the N serially-communicated falling-film evaporators is 4, and the falling-film evaporators are respectively a one-effect falling-film evaporator, a two-effect falling-film evaporator, a three-effect falling-film evaporator and a four-effect falling-film evaporator.
By adopting the four-effect countercurrent falling film evaporation, the 50% alkali can be obtained by evaporating 32% alkali liquor, and compared with the traditional three-effect countercurrent evaporation, the steam consumption can be reduced.
Further, a secondary steam exhaust pipe is connected between every two adjacent falling film evaporators.
Through setting up the secondary steam calandria, can directly use the secondary steam to heat next falling film evaporator, reduced the use of raw steam.
Further, flash evaporation devices for secondary steam condensate are respectively arranged between the two-effect falling-film evaporator and the three-effect falling-film evaporator and between the three-effect falling-film evaporator and the four-effect falling-film evaporator, and the flash evaporation devices are communicated with the secondary steam exhaust pipes.
By arranging the flash evaporation device, the waste heat of the secondary steam condensate is recovered, and the steam consumption is further reduced.
Further, the flash device is a flash tank.
Furthermore, a temperature and humidity reducing device is arranged on the secondary steam exhaust pipe.
By arranging the temperature-reducing humidifier, secondary steam condensate or desalted water is used as make-up water of the temperature-reducing expansion device, so that the superheat degree of secondary steam entering the falling-film evaporator is reduced, the secondary steam is in a state close to saturation, the production stability is improved, and the steam consumption is reduced.
Further, the N-effect falling-film evaporator is connected with a secondary steam condenser.
Through setting up the secondary steam condenser, the secondary steam is sent out the battery limit after circulating water condensation.
Further, the secondary steam condenser is connected with a vacuum system.
The N-effect falling-film evaporator can work under a vacuum condition by connecting the N-effect falling-film evaporator with a vacuum system.
Further, the vacuum system includes a vacuum pump assembly.
The vacuum degree of the system can be maintained by arranging the vacuum pump unit.
Further, the alkali liquor waste heat utilization device and the steam generation waste heat utilization device are both heat exchangers.
The beneficial effects of the utility model are that:
1. by arranging the alkali liquor waste heat utilization device and the steam generation waste heat utilization device, the heat of alkali liquor and steam generation condensate can be reduced, the use of generated steam is reduced, the energy consumption is saved, and the carbon emission is reduced;
2. the flowing direction of the medium in the alkali liquor waste heat utilization device and the steam generation waste heat utilization device is opposite to the flowing direction of the alkali liquor in the falling film evaporator, so that the alkali liquor can be fully preheated, and the alkali liquor can be conveniently concentrated;
3. by adopting the four-effect countercurrent falling film evaporation, the 50% alkali can be obtained by evaporating 32% alkali liquor, and compared with the traditional three-effect countercurrent evaporation, the steam consumption can be reduced;
4. by arranging the secondary steam exhaust pipe, secondary steam can be directly used for heating the next falling film evaporator, so that the use of raw steam is reduced;
5. by arranging the flash evaporation device, the waste heat of the secondary steam condensate is recovered, and the steam consumption is further reduced;
6. the temperature-reducing humidifier is arranged, and secondary steam condensate or desalted water is used as make-up water of the temperature-reducing expander to reduce the superheat degree of secondary steam entering the falling-film evaporator to enable the secondary steam to be in a nearly saturated state, so that the production stability is improved, and the steam consumption is reduced;
7. by arranging a secondary steam condenser, secondary steam is condensed by circulating water and then is sent out of a boundary area;
8. the N-effect falling-film evaporator is connected with a vacuum system, so that the N-effect falling-film evaporator can work under a vacuum condition;
9. the vacuum degree of the system can be maintained by arranging the vacuum pump unit.
Drawings
Fig. 1 is a schematic view of the countercurrent falling film evaporation system of the present invention.
In the figure: the system comprises a 1-one-effect falling film evaporator, a 2-alkali liquor waste heat utilization device, a 3-raw steam waste heat utilization device, a 4-two-effect falling film evaporator, a 5-three-effect falling film evaporator, a 6-four-effect falling film evaporator, a 7-secondary steam exhaust pipe, an 8-flash evaporation device, a 9-temperature reduction humidifier, a 10-secondary steam condenser, an 11-vacuum system and a 12-vacuum pump unit.
Detailed Description
In the present invention, the embodiments and the features of the embodiments may be combined with each other without conflict.
Example 1
A multi-effect countercurrent falling film evaporation system for ionic membrane caustic soda has a specific structure shown in figure 1, and comprises N serially connected and communicated falling film evaporators, wherein the falling film evaporators are sequentially divided into a one-effect falling film evaporator 1, 8230and an N-effect falling film evaporator according to the sequence from high concentration to low concentration of generated alkali liquor, N is more than or equal to 3, an alkali liquor waste heat utilization device 2 and a steam generation waste heat utilization device 3 for heating alkali liquor are connected between the adjacent falling film evaporators, and the flow direction of the medium in the alkali liquor waste heat utilization device 2 and the steam generation waste heat utilization device 3 is opposite to the flow direction of the alkali liquor in the falling film evaporators.
The working principle is as follows: during the use, alkali lye of low concentration gets into from N effect falling film evaporation ware, flows to one effect falling film evaporation ware 1, and the alkali lye of low concentration is preheated through alkali lye waste heat utilization ware 2 and raw steam waste heat utilization ware 3 respectively to the high concentration alkali lye of one effect falling film evaporation ware 1 exhaust and raw steam condensate, and the alkali lye after preheating gets into one effect falling film evaporation ware 1 again, and subsequent falling film evaporation ware work flow is the same with the work flow of one effect falling film evaporation ware 1. Through setting up alkali lye waste heat utilization ware 2 and raw steam waste heat utilization ware 3, can reduce the use of raw steam with the heat of alkali lye and raw steam condensate, practice thrift the energy consumption to reduce carbon and discharge. The flowing direction of the medium in the alkali liquor waste heat utilization device 2 and the steam generation waste heat utilization device 3 is opposite to the flowing direction of the alkali liquor in the falling film evaporator, so that the alkali liquor can be fully preheated, and the alkali liquor can be conveniently concentrated.
Example 2:
in this embodiment, as a preferred embodiment of the present invention, a specific structure is shown in fig. 1, which discloses the following improvement on the basis of embodiment 1, where N in N series-connected falling-film evaporators is 4, the falling-film evaporators are respectively a single-effect falling-film evaporator 1, a double-effect falling-film evaporator 4, a triple-effect falling-film evaporator 5 and a four-effect falling-film evaporator 6, and are adjacent to each other, a secondary steam exhaust pipe 7 is connected between the falling-film evaporators, a flash evaporation device 8 for secondary steam condensate is respectively arranged between the double-effect falling-film evaporator 4 and the triple-effect falling-film evaporator, and between the triple-effect falling-film evaporator 5 and the four-effect falling-film evaporator 6, the flash evaporation device 8 is communicated with the secondary steam exhaust pipe 7, the flash evaporation device 8 is a flash evaporation tank, and a temperature reduction humidifier 9 is arranged on the secondary steam exhaust pipe 7.
By adopting the four-effect countercurrent falling film evaporation, the 50% alkali can be obtained by evaporating 32% alkali liquor, and compared with the traditional three-effect countercurrent evaporation, the steam consumption can be reduced.
Through setting up secondary steam comb pipe 7, can directly use the secondary steam to heat next falling film evaporation ware, reduced the use of raw steam.
By arranging the flash evaporation device 8, the waste heat of the secondary steam condensate is recovered, and the steam consumption is further reduced.
By arranging the temperature-reducing humidifier 9, secondary steam condensate or desalted water is used as make-up water of the temperature-reducing expansion device, so that the superheat degree of secondary steam entering the falling-film evaporator is reduced, the secondary steam is in a state close to saturation, the production stability is improved, and the steam consumption is reduced.
Example 3:
in this embodiment as a preferred embodiment of the present invention, the specific structure is as shown in fig. 1, which discloses the following improvement on the basis of embodiment 2, the four-effect falling-film evaporator 6 is connected with a secondary steam condenser 10, the secondary steam condenser 10 is connected with a vacuum system 11, the vacuum system 11 includes a vacuum pump unit 12, and the lye waste heat utilization device 2 and the raw steam waste heat utilization device 3 are heat exchangers.
By arranging the secondary steam condenser 10, secondary steam is condensed by circulating water and then is sent out of a boundary area.
The four-effect falling-film evaporator 6 is connected with the vacuum system 11, so that the four-effect falling-film evaporator 6 can work under the vacuum condition.
The vacuum degree of the system can be maintained by providing the vacuum pump unit 12.
Claims (10)
1. The multiple-effect countercurrent falling film evaporation system for the ionic membrane caustic soda is characterized by comprising N serially connected and communicated falling film evaporators, wherein the falling film evaporators are sequentially divided into a one-effect falling film evaporator (1), a evaporator 8230and an N-effect falling film evaporator according to the sequence of the concentration of generated alkali liquor from high to low, N is more than or equal to 3, an alkali liquor waste heat utilization device (2) and a steam generation waste heat utilization device (3) for heating the alkali liquor are connected between the adjacent falling film evaporators, and the medium flowing direction in the alkali liquor waste heat utilization device (2) and the steam generation waste heat utilization device (3) is opposite to the alkali liquor flowing direction in the falling film evaporators.
2. A multiple effect counter current falling film evaporation system of ionic film caustic soda as claimed in claim 1 wherein N of N serially connected falling film evaporators is 4,4 of which are a one effect falling film evaporator (1), a two effect falling film evaporator (4), a three effect falling film evaporator (5) and a four effect falling film evaporator (6) respectively.
3. A multiple effect counter current falling film evaporation system of ionic membrane caustic soda as claimed in claim 2 wherein secondary steam exhaust pipes (7) are connected between adjacent falling film evaporators.
4. A multiple effect counter current falling film evaporation system of ionic membrane caustic soda as claimed in claim 3 wherein between the two effect falling film evaporator (4) and the three effect falling film evaporator, between the three effect falling film evaporator (5) and the four effect falling film evaporator (6), there are flash evaporation devices (8) for secondary steam condensate, respectively, the flash evaporation devices (8) are in communication with the secondary steam drain pipe (7).
5. A multi-effect counter-current falling film evaporation system of ionic membrane caustic soda as claimed in claim 4 wherein the flash unit (8) is a flash tank.
6. A multi-effect counter-current falling-film evaporation system of ionic membrane caustic soda as claimed in claim 2 wherein the secondary steam-exhaust pipe (7) is provided with a desuperheater (9).
7. A multiple effect counter current falling film evaporation system of ionic membrane caustic soda as claimed in claim 1 wherein the N effect falling film evaporator is connected with a secondary steam condenser (10).
8. A multi-effect counter-current falling film evaporation system of ionic membrane caustic soda as claimed in claim 7 wherein the secondary steam condenser (10) is connected to a vacuum system (11).
9. A multi-effect counter-current falling film evaporation system of ionic membrane caustic soda as claimed in claim 8 wherein the vacuum system (11) comprises a vacuum pump unit (12).
10. The multi-effect counter-current falling film evaporation system of ionic membrane caustic soda as claimed in claim 1, characterized in that the lye waste heat utilization device (2) and the raw steam waste heat utilization device (3) are both heat exchangers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221818746.XU CN218392283U (en) | 2022-07-14 | 2022-07-14 | Multiple-effect countercurrent falling film evaporation system for ionic membrane caustic soda |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221818746.XU CN218392283U (en) | 2022-07-14 | 2022-07-14 | Multiple-effect countercurrent falling film evaporation system for ionic membrane caustic soda |
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| CN218392283U true CN218392283U (en) | 2023-01-31 |
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| CN202221818746.XU Active CN218392283U (en) | 2022-07-14 | 2022-07-14 | Multiple-effect countercurrent falling film evaporation system for ionic membrane caustic soda |
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- 2022-07-14 CN CN202221818746.XU patent/CN218392283U/en active Active
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