Evaporative crystallization system

Abstract

The utility model relates to an evaporative crystallization system. The raw material liquid barrel is communicated with the preheating system through the raw material pump, the preheating system is communicated with the triple-effect system through a water pipe, the triple-effect system is communicated with the double-effect system through a water pipe and communicated with the plate heat exchanger through a steam pipe, and the double-effect system is communicated with the single-effect system through a water pipe and communicated with the triple-effect system through a steam pipe. The first-effect system is communicated with the concentrated solution collecting system through a water pipe and is communicated with the preheating system through a steam pipe, and a discharging pump is mounted on the water pipe between the first-effect system and the concentrated solution collecting system; the live steam tank is respectively communicated with the preheating system and the first-effect system through steam pipes; the circulating water inlet tank is respectively communicated with the plate heat exchanger and the condenser system through water pipes, and the plate heat exchanger is communicated with the circulating water return tank through a water pipe and communicated with the condenser system through a steam pipe. The heat exchange effect of steam condensate water is greatly improved, the vacuum degree can be stably kept within the process standard range, the boiling point of a solution is reduced, and the steam consumption is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of evaporation crystallization, and in particular to an evaporation crystallization system. Background Art

[0002] The evaporation crystallization system uses a countercurrent feeding process, with the feed liquid and steam flowing in opposite directions. The feed liquid enters the evaporation system from the third-effect separator, where it circulates and heats in the third-effect system. Simultaneously, the third-effect solution is pumped into the second-effect system by a third-effect circulating pump for circulation and heating. Meanwhile, the second-effect solution is pumped into the first-effect system by a second-effect circulating pump for circulation and heating, resulting in a concentrated solution in the first-effect system. Fresh steam is added from the first-effect heater. Secondary steam generated by the first-effect separator serves as a heat source and enters the second-effect heater. Secondary steam generated by the second-effect separator also serves as a heat source and enters the third-effect heater. The steam condensate from the third-effect separator is cooled and reused in a condenser, where the uncooled steam is cooled by cooling circulating water, which is then cooled by a cooling tower.

[0003] The above system has the following problems:

[0004] The temperature of the condenser cooling circulation water increases;

[0005] The vacuum degree decreases, causing the boiling point of the solution to increase;

[0006] Steam usage increases;

[0007] The processing volume has decreased. Utility Model Content

[0008] In order to solve or partially solve the problems existing in the related art, the present application provides an evaporation crystallization system.

[0009] The present application provides an evaporation crystallization system, including a preheating system, a first-effect system, a second-effect system, a third-effect system, a plate heat exchanger 1, a condenser system, a concentrate collection system, a raw liquid barrel 3, a raw steam tank 4, a circulating water inlet tank 5, and a circulating water return tank 6.

[0010] The raw liquid barrel 3 is connected to the preheating system through the raw material pump 7, the preheating system is connected to the three-effect system through a water pipe, the three-effect system is connected to the two-effect system through a water pipe and to the plate heat exchanger 1 through a steam pipe, the two-effect system is connected to the one-effect system through a water pipe and to the three-effect system through a steam pipe, the one-effect system is connected to the concentrate collection system through a water pipe and to the preheating system through a steam pipe, and a discharge pump 2 is installed on the water pipe between the one-effect system and the concentrate collection system; the raw steam tank 4 is respectively connected to the preheating system and the one-effect system through a steam pipe; the circulating water inlet tank 5 is respectively connected to the plate heat exchanger 1 and the condenser system through a water pipe, and the plate heat exchanger 1 is connected to the circulating water return tank 6 through a water pipe and to the condenser system through a steam pipe.

[0011] Optionally, in some schemes, the preheating system includes a first-stage preheater 8, a second-stage preheater 9, a first steam condensate tank 10, and a first condensate pump 11. The first-stage preheater 8, the second-stage preheater 9, the first steam condensate tank 10 and the first condensate pump 11 are connected in sequence through pipes, the raw liquid barrel 3 is connected to the first-stage preheater 8 through the raw material pump 7, the raw steam tank 4 is connected to the second-stage preheater 9 through a steam pipe, the second-stage preheater 9 is connected to the three-effect system through a pipe, and the single-effect system is connected to the first steam condensate tank 10 through a steam pipe. The first-stage preheater 8 and the first steam condensate tank 10 are both provided with drainage pipes connected to the rainwater ditch.

[0012] Optionally, in some embodiments, the single-effect system includes a single-effect heater 12, a single-effect separator 13 and a single-effect circulation pump 14, and the single-effect heater 12, the single-effect separator 13 and the single-effect circulation pump 14 are circulated and connected; the double-effect system includes a double-effect heater 15, a double-effect separator 16 and a double-effect circulation pump 17, and the double-effect heater 15, the double-effect separator 16 and the double-effect circulation pump 17 are circulated and connected; the triple-effect system includes a triple-effect heater 18, a triple-effect separator 19 and a triple-effect circulation pump 20, and the triple-effect heater The heat exchanger 18, the three-effect separator 19 and the three-effect circulation pump 20 are circulated and connected. The raw steam tank 4 is connected to the first-effect heater 12 and the first steam condensate tank 10 in sequence through the steam pipe. The first-effect separator 13 is connected to the discharge pump 2 and the second-effect heater 15 respectively. The second-effect circulation pump 17 is connected to the first-effect circulation pump 14. The second-effect separator 16 is connected to the three-effect heater 18. The three-effect circulation pump 20 is connected to the second-effect circulation pump 17. The second-stage preheater 9 is connected to the three-effect separator 19 and the plate heat exchanger 1 through pipelines in sequence.

[0013] Optionally, in some schemes, the condenser system includes a condenser 21, a vacuum pump 22, a steam-water separator 23, a second evaporative condensate tank 24, and a second condensate pump 25. The plate heat exchanger 1 is connected to the condenser 21 through a steam pipe, and the condenser 21 is connected to the vacuum pump 22 and the steam-water separator 23 in sequence through pipelines. The condenser 21 and the steam-water separator 23 are respectively connected to the circulating water return tank 6 through water pipes, and a vent hole is installed on the steam-water separator 23. The condenser 21 is also connected to the second evaporative condensate tank 24 through a sewage pipe, and the bottom of the second evaporative condensate tank 24 is connected to the clean wastewater collection tank through the second condensate pump 25.

[0014] Optionally, in some schemes, the concentrate collection system includes a thickener 26, a centrifuge 27, a drying bed 28, a mother liquor barrel 29, and a mother liquor pump 30. The discharge pump 2 is connected to the thickener 26, and the lower end of the thickener 26 is connected to the centrifuge 27. A drying bed 28 is provided on the rear side of the centrifuge 27 and is connected to the mother liquor barrel 29 through a pipeline. The upper layer of the thickener 26 is connected to the mother liquor barrel 29, and the mother liquor barrel 29 is connected to the first-effect circulation pump 14 through the mother liquor pump 30.

[0015] Optionally, in some solutions, the mother liquor barrel 29 is further connected to an emergency pool 31 , and the emergency pool 31 is connected to a pretreatment primary neutralization tank 32 .

[0016] The technical solution provided by this application may have the following beneficial effects:

[0017] This application significantly improves the heat exchange effect of steam condensate, the vacuum degree can be stably maintained within the process standard range, the boiling point of the solution is lowered, the steam consumption is reduced, and the processing capacity is doubled compared with the original system value;

[0018] Specifically, the concentrated water treatment capacity has been increased from the original 3T / h to the current 5T / h, and the condensed water temperature has been reduced from the original 38℃ to the current 33℃. 3 The consumption of concentrated steam has been reduced from the original 1.1t / h to the current 0.6t / h.

[0019] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and other objects, features and advantages of the present application will become more apparent through a more detailed description of exemplary embodiments of the present application in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the present application.

[0021] Figure 1 It is a connection block diagram of the evaporation crystallization system shown in the embodiment of the present application.

[0022] Reference numerals:

[0023] 1-plate heat exchanger, 2-discharge pump, 3-raw liquid barrel, 4-raw steam tank, 5-circulating water inlet tank, 6-circulating water return tank, 7-raw material pump, 8-first stage preheater, 9-second stage preheater, 10-first steam condensate tank, 11-first condensate pump, 12-first effect heater, 13-first effect separator, 14-first effect circulating pump, 15-second effect heater, 16-second effect separator, 17-second effect circulating pump, 18-triple effect heater, 19-triple effect separator, 20-triple effect circulating pump, 21-condenser, 22-vacuum pump, 23-steam-water separator, 24-second evaporation condensate tank, 25-second condensate pump, 26-thickener, 27-centrifuge, 28-drying bed, 29-mother liquor barrel, 30-mother liquor pump, 31-emergency tank, 32-pretreatment first stage neutralization tank. DETAILED DESCRIPTION

[0024] The following describes embodiments of the present application in more detail with reference to the accompanying drawings. Although the accompanying drawings illustrate embodiments of the present application, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments described herein. Rather, these embodiments are provided to make the present application more thorough and complete, and to fully convey the scope of the present application to those skilled in the art.

[0025] It should be understood that although the terms "first", "second", "third", etc. may be used in this application to describe various information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0026] In the description of this application, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0027] Unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be interpreted broadly. For example, they may refer to fixed or detachable connections, or integration; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0028] In response to the above problems, an embodiment of the present application provides an evaporation crystallization system.

[0029] The technical solutions of the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0030] See also Figure 1 The evaporation crystallization system includes a preheating system, a first-effect system, a second-effect system, a third-effect system, a plate heat exchanger 1, a condenser system, a concentrate collection system, a raw liquid barrel 3, a raw steam tank 4, a circulating water inlet tank 5, and a circulating water return tank 6.

[0031] The raw liquid barrel 3 is connected to the preheating system through the raw material pump 7, the preheating system is connected to the three-effect system through a water pipe, the three-effect system is connected to the two-effect system through a water pipe and to the plate heat exchanger 1 through a steam pipe, the two-effect system is connected to the one-effect system through a water pipe and to the three-effect system through a steam pipe, the one-effect system is connected to the concentrate collection system through a water pipe and to the preheating system through a steam pipe, and a discharge pump 2 is installed on the water pipe between the one-effect system and the concentrate collection system; the raw steam tank 4 is respectively connected to the preheating system and the one-effect system through a steam pipe; the circulating water inlet tank 5 is respectively connected to the plate heat exchanger 1 and the condenser system through a water pipe, and the plate heat exchanger 1 is connected to the circulating water return tank 6 through a water pipe and to the condenser system through a steam pipe.

[0032] In some embodiments, the preheating system includes a first-stage preheater 8, a second-stage preheater 9, a first steam condensate tank 10, and a first condensate pump 11. The first-stage preheater 8, the second-stage preheater 9, the first steam condensate tank 10 and the first condensate pump 11 are connected in sequence through pipes, the raw liquid barrel 3 is connected to the first-stage preheater 8 through the raw material pump 7, the raw steam tank 4 is connected to the second-stage preheater 9 through a steam pipe, the second-stage preheater 9 is connected to the three-effect system through a pipe, and the single-effect system is connected to the first steam condensate tank 10 through a steam pipe. The first-stage preheater 8 and the first steam condensate tank 10 are both provided with drainage pipes connected to the rainwater ditch.

[0033] In some embodiments, the single-effect system includes a single-effect heater 12, a single-effect separator 13, and a single-effect circulation pump 14, which are circulated in a loop; the double-effect system includes a double-effect heater 15, a double-effect separator 16, and a double-effect circulation pump 17, which are circulated in a loop; the triple-effect system includes a triple-effect heater 18, a triple-effect separator 19, and a triple-effect circulation pump 20, which are circulated in a loop; The steam tank 4 is connected to the first-effect heater 12 and the first steam condensate tank 10 in sequence through the steam pipe. The first-effect separator 13 is connected to the discharge pump 2 and the second-effect heater 15 respectively. The second-effect circulation pump 17 is connected to the first-effect circulation pump 14. The second-effect separator 16 is connected to the triple-effect heater 18. The triple-effect circulation pump 20 is connected to the second-effect circulation pump 17. The second-stage preheater 9 is connected to the triple-effect separator 19 and the plate heat exchanger 1 through pipelines in sequence.

[0034] In some embodiments, the condenser system includes a condenser 21, a vacuum pump 22, a steam-water separator 23, a second evaporative condensate tank 24, and a second condensate pump 25. The plate heat exchanger 1 is connected to the condenser 21 through a steam pipe, and the condenser 21 is connected to the vacuum pump 22 and the steam-water separator 23 in sequence through pipelines. The condenser 21 and the steam-water separator 23 are respectively connected to the circulating water return tank 6 through water pipes, and a vent hole is installed on the steam-water separator 23. The condenser 21 is also connected to the second evaporative condensate tank 24 through a sewage pipe, and the bottom of the second evaporative condensate tank 24 is connected to the clean wastewater collection tank through the second condensate pump 25.

[0035] In some embodiments, the concentrate collection system includes a thickener 26, a centrifuge 27, a drying bed 28, a mother liquor barrel 29, and a mother liquor pump 30. The discharge pump 2 is connected to the thickener 26, the lower end of the thickener 26 is connected to the centrifuge 27, a drying bed 28 is provided on the rear side of the centrifuge 27, and is connected to the mother liquor barrel 29 through a pipeline. The upper layer of the thickener 26 is connected to the mother liquor barrel 29, and the mother liquor barrel 29 is connected to the first-effect circulation pump 14 through the mother liquor pump 30.

[0036] In some embodiments, the mother liquor barrel 29 is further connected to an emergency tank 31 , and the emergency tank 31 is connected to a pre-treatment primary neutralization tank 32 .

[0037] Working process:

[0038] The raw material liquid enters the triple-effect separator 19 after passing through the first-stage preheater 8 and the second-stage preheater 9, and is circulated and heated in the triple-effect system. The triple-effect solution is sent to the second-effect system for circulated heating by the triple-effect circulation pump 20, and the second-effect solution is sent to the first-effect system for circulated heating by the second-effect circulation pump 17. A concentrated liquid is obtained in the first-effect system, and the concentrated liquid enters the thickener 26 through the discharge pump 2. The lower layer solution of the thickener 26 enters the centrifuge 27. The fixed material separated by the centrifuge 27 enters the drying bed 28 for drying, and then is placed in the silo for the production of sodium sulfate products. The upper layer solution of the thickener 26 and the solution produced by the centrifuge 27 both enter the mother liquor barrel 29, and then return to the first-effect system for circulated heating through the mother liquor pump 30. The mother liquor barrel 29 is also connected to the emergency tank 31, and the emergency tank 31 is connected to the pretreatment first-stage neutralization tank 32.

[0039] Raw steam is added from the first-effect heater 12, the secondary steam generated by the first-effect separator 13 enters the second-effect heater 15, the tertiary steam generated by the second-effect separator 16 enters the triple-effect heater 18, and the steam condensate generated by the triple-effect separator 19 is heat-exchanged through the plate heat exchanger 1 and then enters the condenser 21 for cooling and reuse. The uncooled steam is cooled by cooling circulating water in the condenser 21, and the condensate generated by the condenser 21 enters the circulating water return tank 6 for recovery. The steam enters the steam-water separator 23, and the water separated by the steam-water separator 23 enters the circulating water return tank 6 for recovery, and the generated cold air is discharged into the air.

[0040] Finally, it should be noted that, in this document, relationships such as first and second, etc., are used solely to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms include, comprise, or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0041] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0042] The embodiments of the present application have been described above. The above description is illustrative and not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is selected to best explain the principles of the embodiments, their practical applications, or improvements to the technology in the market, or to enable other persons skilled in the art to understand the embodiments disclosed herein.

Claims

1. An evaporation crystallization system, characterized in that: The evaporation crystallization system comprises a preheating system, a first-effect system, a second-effect system, a third-effect system, a plate heat exchanger (1), a condenser system, a concentrate collection system, a raw liquid barrel (3), a raw steam tank (4), a circulating water inlet tank (5), and a circulating water return tank (6); The raw liquid barrel (3) is connected to the preheating system through the raw material pump (7), the preheating system is connected to the three-effect system through the water pipe, the three-effect system is connected to the two-effect system through the water pipe and is connected to the plate heat exchanger (1) through the steam pipe, the two-effect system is connected to the single-effect system through the water pipe and is connected to the three-effect system through the steam pipe, the single-effect system is connected to the concentrated liquid collection system through the water pipe and is connected to the preheating system through the steam pipe, and a discharge pump (2) is installed on the water pipe between the single-effect system and the concentrated liquid collection system; the raw steam tank (4) is connected to the preheating system and the single-effect system respectively through the steam pipe; the circulating water inlet tank (5) is connected to the plate heat exchanger (1) and the condenser system respectively through the water pipe, and the plate heat exchanger (1) is connected to the circulating water return tank (6) through the water pipe and is connected to the condenser system through the steam pipe.

2. The evaporation crystallization system according to claim 1, characterized in that: The preheating system includes a first-stage preheater (8), a second-stage preheater (9), a first steam condensate tank (10), and a first condensate pump (11). The first-stage preheater (8), the second-stage preheater (9), the first steam condensate tank (10), and the first condensate pump (11) are connected in sequence through pipelines. The raw liquid barrel (3) is connected to the first-stage preheater (8) through the raw material pump (7). The raw steam tank (4) is connected to the second-stage preheater (9) through a steam pipe. The second-stage preheater (9) is connected to the three-effect system through a pipeline. The single-effect system is connected to the first steam condensate tank (10) through a steam pipe. The first-stage preheater (8) and the first steam condensate tank (10) are both provided with drainage pipes connected to rainwater ditches.

3. The evaporation crystallization system according to claim 2, characterized in that: The single-effect system comprises a single-effect heater (12), a single-effect separator (13) and a single-effect circulation pump (14), wherein the single-effect heater (12), the single-effect separator (13) and the single-effect circulation pump (14) are circulated and connected; the double-effect system comprises a double-effect heater (15), a double-effect separator (16) and a double-effect circulation pump (17), wherein the double-effect heater (15), the double-effect separator (16) and the double-effect circulation pump (17) are circulated and connected; the triple-effect system comprises a triple-effect heater (18), a triple-effect separator (19) and a triple-effect circulation pump (20), wherein the triple-effect heater (18), the triple-effect separator (19) and the triple-effect circulation pump (20) are circulated and connected. The first-effect separator (19) and the third-effect circulation pump (20) are circulated and connected. The raw steam tank (4) is sequentially connected to the first-effect heater (12) and the first steam condensate tank (10) through a steam pipe. The first-effect separator (13) is respectively connected to the discharge pump (2) and the second-effect heater (15). The second-effect circulation pump (17) is connected to the first-effect circulation pump (14). The second-effect separator (16) is connected to the third-effect heater (18). The third-effect circulation pump (20) is connected to the second-effect circulation pump (17). The second-stage preheater (9) is sequentially connected to the third-effect separator (19) and the plate heat exchanger (1) through pipelines.

4. The evaporation crystallization system according to claim 3, characterized in that: The condenser system comprises a condenser (21), a vacuum pump (22), a steam-water separator (23), a second evaporative condensate tank (24), and a second condensate pump (25). The plate heat exchanger (1) is connected to the condenser (21) through a steam pipe. The condenser (21) is connected to the vacuum pump (22) and the steam-water separator (23) in sequence through pipelines. The condenser (21) and the steam-water separator (23) are respectively connected to the circulating water return tank (6) through water pipes, and a vent hole is installed on the steam-water separator (23). The condenser (21) is also connected to the second evaporative condensate tank (24) through a sewage pipe. The bottom of the second evaporative condensate tank (24) is connected to the clean wastewater collection pool through the second condensate pump (25).

5. The evaporation crystallization system according to claim 4, characterized in that: The concentrate collection system includes a thickener (26), a centrifuge (27), a drying bed (28), a mother liquor barrel (29), and a mother liquor pump (30). The discharge pump (2) is connected to the thickener (26). The lower end of the thickener (26) is connected to the centrifuge (27). A drying bed (28) is provided on the rear side of the centrifuge (27) and is connected to the mother liquor barrel (29) through a pipeline. The upper layer of the thickener (26) is connected to the mother liquor barrel (29), and the mother liquor barrel (29) is connected to a first-effect circulation pump (14) through the mother liquor pump (30).

6. The evaporation crystallization system according to claim 5, characterized in that: The mother liquid barrel (29) is also connected to an emergency pool (31), and the emergency pool (31) is connected to a pre-treatment primary neutralization tank (32).

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