A solution internal circulation evaporation system

Abstract

The present application discloses a solution internal circulation evaporation system, comprising an evaporation device, a steam compression device and a solution delivery device, wherein the steam compression device is installed on one side of the evaporation device, and the solution delivery device is installed on the other side of the evaporation device, and the steam compression device and the solution delivery device are both connected to the evaporation device. The present application uses a thousand-page heat synchronous exchanger to concentrate and evaporate the liquid to be concentrated, and the installation of gaps in multiple folding pages increases the heat conduction area, and at the same time sprays a non-stick layer, and facilitates the cleaning of precipitated attachments generated during evaporation and concentration.

Description

Technical Field

[0001] The present application relates to the technical field of evaporation and concentration equipment, and in particular to a solution internal circulation evaporation system. Background Art

[0002] In many fields, such as chemical industry, metal smelting, food, pharmaceuticals, feed fermentation, steel plant power plant ammonium desulfurization, oil and gas fields and other industries, different types of evaporation equipment are used to produce products or treat wastewater.

[0003] In the prior art, most devices used for evaporation heat cycle use spiral tube evaporation tubes for heat transfer. The tubes are relatively long and are installed in circular superheater tubes for superheating. After a long period of use, dirt will appear in the tubes and adhere to the walls of the liquid-passing tubes. Long-term accumulation and adhesion will cause blockage of the heat exchange tubes, which are not easy to clean. In serious cases, the heating tubes will need to be replaced, which greatly increases the cost of use. Summary of the invention

[0004] The purpose of the present application is to overcome the shortcomings of the prior art and provide a solution internal circulation evaporation system.

[0005] The purpose of this application is achieved through the following technical solutions:

[0006] A solution internal circulation evaporation system comprises an evaporation device, a steam compression device and a solution delivery device, wherein the steam compression device is installed on one side of the evaporation device, the solution delivery device is installed on the other side of the evaporation device, and the steam compression device and the solution delivery device are both connected to the evaporation device.

[0007] A further technical solution is that the evaporation device includes an evaporation tank and a thousand-page heat synchronous exchanger, the thousand-page heat synchronous exchanger is arranged inside the evaporation tank, the thousand-page heat synchronous exchanger divides the evaporation tank into an evaporation bin and a bottom bin, an electric heater is installed in the bottom bin, the thousand-page heat synchronous exchanger includes a plurality of folding page inner gaps, folding page outer gaps, an air collecting hood and a thousand-page lower bottom plate, the thousand-page lower bottom plate is provided with inner gap water outlet holes and air inlet holes, the inner gap water outlet holes are arranged in a circular array with the air inlet hole as the center, a steam channel is provided between the inner gap water outlet holes and the air inlet holes, the inner gap of the folding page is arranged outside the steam channel, the height of the inner gap of the folding page is higher than the height of the steam channel, and a heat exchange channel is formed between the inner gap of the folding page and the steam channel, the inner gap of the folding page is connected with the bottom bin through the inner gap water outlet holes, and a cover is provided on the upper part of the inner gap of the folding page, and the cover is located above the steam channel.

[0008] A further technical solution is that the steam compression device includes a steam compressor, a steam collecting pipe and a steam inlet pipe, the steam collecting pipe and the steam inlet pipe are both connected to the steam compressor, and the open end of the steam collecting pipe is arranged in the evaporation bin, and the open end of the steam inlet pipe is arranged in the bottom bin.

[0009] A further technical solution is that the solution conveying device includes a solution heat exchanger, a raw liquid tank and a condensate recovery tank, a liquid supply pump is provided between the solution heat exchanger and the raw liquid tank, and the solution heat exchanger is connected to the condensate recovery tank through a pipeline.

[0010] A further technical solution is that a defoaming net is arranged in the evaporation bin, and there are two defoaming nets. The opening end of the steam collecting pipe is located above the defoaming net, and the opening end of the steam collecting pipe is close to the gland.

[0011] A further technical solution is that the air collecting hood is arranged at the lower part of the air inlet, and the air collecting hood and the bottom of the bottom bin form an overflow chamber.

[0012] A further technical solution is that the evaporation tank is provided with a preheating liquid inlet, a concentrated liquid outlet and a water outlet pipe, the preheating liquid inlet and the concentrated liquid outlet are both connected to the evaporation bin, the water outlet pipe is connected to the bottom bin, the preheating liquid inlet is arranged at the upper part of the concentrated liquid outlet, the water outlet pipe is located at the lower part of the concentrated liquid outlet, the evaporation bin is connected to the solution heat exchanger through the preheating liquid inlet, and the water outlet pipe is connected to the solution heat exchanger through a safety valve.

[0013] A further technical solution is that the concentrated liquid outlet is arranged close to the lower bottom plate of the thousand-leaf machine, and the preheated raw liquid inlet is located higher than the thousand-leaf heat synchronous exchanger.

[0014] A further technical solution is that a first elbow is provided on the concentrate outlet, the opening of the first elbow faces the lower bottom plate of the fan, and a second elbow is provided on the water outlet pipe, the opening end of the second elbow faces the lower bottom plate of the fan.

[0015] This application has the following advantages:

[0016] 1. The present application uses a thousand-page heat synchronous exchanger to concentrate and evaporate the liquid to be concentrated. The installation of gaps in multiple folded pages increases the heat conduction area. At the same time, a non-stick layer is sprayed, and the precipitate attachments generated during evaporation and concentration are easy to clean.

[0017] 2. The present application greatly saves water resources and realizes water circulation. The solution is evaporated through a thousand-page heat synchronous exchanger, and the evaporated steam condenses into water to provide water for heat circulation in the bottom bin. A condensate outlet is provided in the evaporation bin. When the amount of water in the bottom bin exceeds the water limit capacity of the bottom bin, the excess condensate with heat in the bottom bin can be sent to the solution heat exchanger through the water pipe outlet. The solution is preheated by the solution heat exchanger. After the solution is preheated, the heat utilization efficiency of the evaporation bin for solution evaporation is greatly increased.

[0018] 3. The present application provides a defoaming net in the evaporation chamber, and the defoaming net has two layers, upper and lower, to reduce boiling foam generated by heating the liquid and prevent the foam from carrying impurities into the steam collection pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the structure of this application

[0020] Figure 2 Schematic diagram of the structure of Qianye heat synchronous exchanger

[0021] Figure 3 A top view of the structure of the Qianye heat exchanger

[0022] Figure 4 for Figure 3 Schematic diagram of the cross-section structure in the AA direction

[0023] Figure 5 A schematic diagram of the structure of the Qianye heat exchanger

[0024] Figure 6 for Figure 5 Schematic diagram of the cross-section structure in the middle BB direction

[0025] Figure 7 for Figure 5 Schematic diagram of the cross-section structure in the CC direction

[0026] Figure 8 Schematic diagram of the steam and liquid flow structure for this application

[0027] In the figure: 1. bottom bin; 2. air collecting hood; 3. thousand-leaf heat synchronous exchanger; 4. electric heater; 5. evaporation bin; 6. pressure cover; 7. defoaming net; 8. steam collecting pipe; 9. steam compressor; 10. steam inlet pipe; 11. water outlet pipe; 12. safety valve; 13. solution heat exchanger; 14. preheating stock liquid inlet; 15. concentrate outlet; 16. liquid supply pump; 17. stock liquid tank; 18. condensate recovery tank; 19. foot; 20. overflow chamber; 301. gap inside folding page; 302. gap outside folding page; 303. bottom plate under thousand-leaf; 304. water outlet hole in the inner gap; 305. air inlet; 306. through hole; 307. steam channel. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents the selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0030] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other.

[0031] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0032] In the description of the present application, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the application is usually placed when in use, or the positions or positional relationships commonly understood by those skilled in the art. They are only for the convenience of describing the present 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 the present application. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0033] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0034] like Figures 1 to 5As shown, a solution internal circulation evaporation system includes an evaporation device, a steam compression device and a solution delivery device, wherein the steam compression device is installed on one side of the evaporation device, and the solution delivery device is installed on the other side of the evaporation device, and the steam compression device and the solution delivery device are both connected to the evaporation device.

[0035] In this embodiment, the evaporation device includes an evaporation tank and a thousand-page heat synchronous exchanger 3, the thousand-page heat synchronous exchanger 3 is arranged inside the evaporation tank, the thousand-page heat synchronous exchanger 3 divides the evaporation tank into an evaporation bin 5 and a bottom bin 1, an electric heater 4 is installed in the bottom bin 1, the thousand-page heat synchronous exchanger 3 includes a plurality of folding page inner gaps 301, folding page outer gaps 302, an air collecting hood 2 and a thousand-page lower bottom plate 303, the thousand-page lower bottom plate 303 is provided with inner gap water outlet holes 304 and air inlet holes 305, the inner gap water outlet holes 304 are arranged in a circular array with the air inlet hole 305 as the center, a steam channel 307 is arranged between the inner gap water outlet holes 304 and the air inlet hole 305, separating the inner gap water outlet holes 304 and the air inlet hole 305, and the folding page inner gap 301 is fixedly arranged Outside the steam channel 307, the height of the folding page inner gap 301 is higher than the height of the steam channel 307, and the folding page inner gap 301 is formed between the folding page inner gap 301 and the steam channel 307, the folding page inner gap 301 is connected with the bottom bin 1 through the inner gap water outlet hole 304, a cover is provided on the upper part of the folding page inner gap 301, and a through hole 306 is formed between the cover and the steam channel 307, the steam channel 307 and the folding page inner gap 301 are connected through the through hole 306, and the bottom bin 1 is connected with the steam channel 307 through the air inlet hole 305; the steam channel 307 is connected with the folding page inner gap 301; the folding page inner gap 301 is connected with the bottom bin 1 through the inner gap water outlet hole 304 to form a circulation pipeline.

[0036] In this embodiment, the outer surface of the Qianye heat synchronous exchanger 3 can be sprayed with food-grade non-stick coating Teflon for corrosion protection.

[0037] In this embodiment, the steam compression device includes a steam compressor 9, a steam collecting pipe 8 and a steam inlet pipe 10. The steam collecting pipe 8 and the steam inlet pipe 10 are both connected to the steam compressor 9, and the open end of the steam collecting pipe 8 is arranged in the evaporation bin 5, and the open end of the steam inlet pipe 10 is arranged in the bottom bin 1. The steam compressor 9 pressurizes the steam in the evaporation bin 5 through the steam collecting pipe 8, and the pressurized steam is sent into the bottom bin 1 for heat circulation by the steam inlet pipe 10.

[0038] In this embodiment, the solution conveying device includes a solution heat exchanger 13, a raw liquid tank 17 and a condensate recovery tank 18. A liquid supply pump 16 is arranged between the solution heat exchanger 13 and the raw liquid tank 17. The solution heat exchanger 13 and the condensate recovery tank 18 are connected by a pipeline. The solution in the raw liquid tank 17 enters the solution heat exchanger 13 through the liquid supply pump 16 for preheating treatment.

[0039] In this embodiment, a defoaming net 7 is provided in the evaporation bin 5, and there are two defoaming nets 7. The opening end of the steam collecting pipe 8 is located at the upper part of the defoaming net 7. The opening end of the steam collecting pipe 8 is close to the pressure cover 6, and the defoaming net 7 has two layers, upper and lower, to reduce boiling foam generated by heating the liquid and prevent the foam from carrying impurities into the steam collecting pipe 8.

[0040] In this embodiment, the air collecting hood 2 is arranged at the lower part of the air inlet hole 305, and the air collecting hood 2 and the bottom of the bottom bin 1 form an overflow chamber 20. When the solution in the bottom bin 1 enters the overflow chamber 20, the solution height is higher than the overflow chamber 20, and then enters the solution heat exchanger 13 through the outlet pipe 11. A safety valve 12 is also provided on the outlet pipe 11 to protect the equipment and prevent excessive pressure.

[0041] In this embodiment, the evaporation tank is provided with a preheating liquid inlet 14, a concentrated liquid outlet 15 and a water outlet pipe 11. The preheating liquid inlet 14 and the concentrated liquid outlet 15 are both connected to the evaporation bin 5, the water outlet pipe is connected to the bottom bin 1, and the water outlet pipe is connected to the water outlet pipe 11. The preheating liquid inlet 14 is arranged at the upper part of the concentrated liquid outlet 15, and the water outlet pipe 11 is located at the lower part of the concentrated liquid outlet 15. The evaporation bin 5 is connected to the solution heat exchanger 13 through the preheating liquid inlet 14.

[0042] In this embodiment, the concentrated liquid outlet 15 is arranged close to the lower bottom plate 303 of the thousand-leaf heat exchanger, and the preheating raw liquid inlet 14 is located higher than the thousand-leaf heat synchronous exchanger 3.

[0043] In this embodiment, a foot 19 is provided at the bottom of the steam tank, and the foot 19 fixes the steam tank.

[0044] In this embodiment, a first elbow is provided on the concentrated liquid outlet 15 , and its opening faces the lower bottom plate 303 of the fan-shaped window. A second elbow is provided on the water outlet pipe, and its opening faces the lower bottom plate 303 of the fan-shaped window.

[0045] The working process of the present application is as follows: high-pressure water vapor is formed by the electric heater 4 and the steam compressor 9, and the high-pressure water vapor enters the steam channel 307 from the gas collecting hood 2, and then enters the gap 301 in each folding page from the steam channel 307, and the gap 301 in the folding page exchanges heat with the solution in the evaporation bin 5. When the high-temperature and high-pressure water vapor exchanges heat with the gap 301 in the folding page, the heat it carries is dissipated into the evaporation bin 5, and the high-temperature and high-pressure steam is cooled into water after absorbing the heat. The condensed water flows back to the bottom bin through the water outlet hole 304 in the inner gap for storage and heating, and forms water vapor again. When the amount of condensed water in the bottom bin 1 exceeds the limited capacity of the bottom bin 1, the excess condensed water can be discharged from the bottom bin through the water pipe outlet. 1 is sent to the solution heat exchanger 13, and the solution is preheated by the solution heat exchanger 13. The condensed water after heat exchange finally flows into the condensed water recovery tank 18. The preheated solution enters the evaporation bin 5 through the preheating stock solution inlet 14 for evaporation and concentration. The steam evaporated in the evaporation bin 5 is collected by the steam collecting pipe 8, and the collected steam is compressed into high-pressure gas by the steam compressor 9 and enters the bottom bin 1 again for circulation; when there is no steam in the evaporation bin 5, the water in the bottom bin 1 is heated by the electric heater 4 in the bottom bin to form high-pressure steam to heat the water in the solution through the gap in the folding page at the center of the evaporation bin 5, and the heating state is controlled by the safety valve 12.

[0046] Although the present application has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A solution internal circulation evaporation system, characterized in that: The invention comprises an evaporation device, a steam compression device and a solution delivery device, wherein the steam compression device is installed on one side of the evaporation device, the solution delivery device is installed on the other side of the evaporation device, and the steam compression device and the solution delivery device are both connected to the evaporation device; the evaporation device comprises an evaporation tank and a thousand-page heat synchronous exchanger, the thousand-page heat synchronous exchanger is arranged inside the evaporation tank, the thousand-page heat synchronous exchanger separates the evaporation tank into an evaporation bin and a bottom bin, an electric heater is installed in the bottom bin, and the thousand-page heat synchronous exchanger comprises a plurality of folding The inner gap of the page, the outer gap of the folding page, the air collecting hood and the lower bottom plate of the fan leaf are provided with inner gap water outlet holes and air inlet holes, the inner gap water outlet holes are arranged in a circular array with the air inlet hole as the center, a steam channel is arranged between the inner gap water outlet holes and the air inlet holes, the inner gap of the folding page is arranged outside the steam channel, the height of the inner gap of the folding page is higher than the height of the steam channel, and a heat exchange channel is formed between the inner gap of the folding page and the steam channel, the inner gap of the folding page is connected with the bottom bin through the inner gap water outlet holes, and the inner gap of the folding page is connected with the bottom bin through the inner gap water outlet holes. A sealing cover is provided at the upper part of the gap in the folding page, and the sealing cover is located above the steam channel; the steam compression device includes a steam compressor, a steam collecting pipe and a steam inlet pipe, the steam collecting pipe and the steam inlet pipe are both connected to the steam compressor, and the open end of the steam collecting pipe is arranged in the evaporation bin, and the open end of the steam inlet pipe is arranged in the bottom bin; the solution conveying device includes a solution heat exchanger, a raw liquid tank and a condensate recovery tank, a liquid supply pump is provided between the solution heat exchanger and the raw liquid tank, and the solution heat exchanger and the condensate recovery tank are connected through The gas collecting hood is arranged at the lower part of the air inlet, and the gas collecting hood and the bottom of the bottom bin form an overflow chamber; the evaporation tank is provided with a preheating stock liquid inlet, a concentrated liquid outlet and a water outlet pipe, the preheating stock liquid inlet and the concentrated liquid outlet are both connected to the evaporation bin, the water outlet pipe is connected to the bottom bin, the preheating stock liquid inlet is arranged at the upper part of the concentrated liquid outlet, the water outlet pipe is located at the lower part of the concentrated liquid outlet, the evaporation bin is connected to the solution heat exchanger through the preheating stock liquid inlet, and the water outlet pipe is connected to the solution heat exchanger through a safety valve.

2. A solution internal circulation evaporation system according to claim 1, characterized in that: The evaporation chamber is provided with a defoaming net, and there are two defoaming nets. The opening end of the steam collecting pipe is located above the defoaming net, and the opening end of the steam collecting pipe is close to the gland.

3. A solution internal circulation evaporation system according to claim 1, characterized in that: The concentrated liquid outlet is arranged close to the lower bottom plate of the thousand-leaf heat exchanger, and the preheated raw liquid inlet is located higher than the thousand-leaf heat synchronous exchanger.

4. A solution internal circulation evaporation system according to claim 3, characterized in that: A first elbow is provided on the concentrate outlet, and the opening of the first elbow faces the lower bottom plate of the fan-shaped leaf. A second elbow is provided on the water outlet pipe, and the opening end of the second elbow faces the lower bottom plate of the fan-shaped leaf.

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