Degassing concentrator

Abstract

The utility model discloses a degassing concentrator which comprises a separator with a separation inlet and a separation outlet at the bottom and a steam outlet at the top; the heater is provided with a heating medium inlet, a heating medium outlet, a heating inlet, a heating outlet and a concentration outlet, the heating outlet is communicated with the separation inlet, and the concentration outlet is connected with a discharge valve; the circulating pipe is communicated between the separation outlet and the heating inlet and is provided with a feeding hole for inputting feed liquid; and the condensation assembly is used for discharging condensate water and non-condensable gas after condensing the secondary steam discharged from the steam outlet. According to the degassing concentrator, feed liquid is heated through the heater, so that the feed liquid is evaporated in the separator, the amount of soluble gas in the feed liquid is reduced, corrosion to the evaporation and concentration crystallizer is reduced, the service life is prolonged, the cost is reduced, circular flowing is achieved through the density difference and the temperature difference of the feed liquid, a circulating pump is not needed, and energy consumption is reduced; the treatment cost is further reduced.

Description

Technical Field

[0001] This utility model relates to the field of waste liquid evaporation treatment technology, and in particular to a degassing concentrator. Background Technology

[0002] An evaporation concentration crystallizer is a device that concentrates a solution and crystallizes the solute by evaporating the solvent. When it is running, the liquid to be processed is sent into the evaporator, and the solvent is evaporated by heating. The concentration of the solution gradually increases. After reaching saturation, the solute begins to crystallize and precipitate. Then, the crystallized product is obtained by solid-liquid separation methods such as filtration and centrifugation.

[0003] However, during the evaporation and concentration process, the feed liquid contains dissolved oxygen, carbon dioxide, and hydrogen sulfide, making the overall feed liquid acidic. During heating, the acidic feed liquid will corrode and damage the walls of the evaporator and concentrator, shortening its service life and increasing maintenance and replacement costs. Furthermore, during heating, as the temperature rises, these dissolved gases escape from the feed liquid, forming bubbles that adhere to the heat exchange surface and form a gas film, hindering heat transfer and reducing heat exchange efficiency.

[0004] Therefore, there is an urgent need for a pretreatment device for evaporation and concentration crystallizers to reduce soluble gases in the feed liquid, thereby reducing the corrosion of the evaporation and concentration crystallizer by the feed liquid and extending its service life. Utility Model Content

[0005] The purpose of this invention is to overcome the defects in the existing technology and provide a degassing concentrator that reduces the amount of soluble gas in the feed liquid, thereby extending the service life of the evaporation concentrator and reducing the processing cost.

[0006] To achieve the above-mentioned technical effects, the technical solution of this utility model is: a degassing concentrator for degassing the feed liquid in an evaporator concentrator, comprising:

[0007] The separator has a separation inlet and a separation outlet at the bottom, and a steam outlet at the top.

[0008] The heater has a heat medium inlet, a heat medium outlet, a heating inlet, a heating outlet, and a concentration outlet. The heating outlet is connected to the separation inlet, and the concentration outlet is connected to a discharge valve.

[0009] A circulation pipe is connected between the separation outlet and the heating inlet and is provided with a feed port for inputting liquid.

[0010] The condenser assembly is used to condense the secondary steam discharged from the steam outlet and then discharge condensate and non-condensable gases.

[0011] Preferably, in order to increase the evaporation area and facilitate exhaust, the separator is a horizontal separator.

[0012] Preferably, in order to promote the circulation of the liquid feed, the heating outlet and the circulation pipe are respectively connected to the bottom two ends of the separator.

[0013] Preferably, in order to facilitate the circulation of the liquid and promote the evaporation of the higher temperature liquid inside the separator, the heater is arranged vertically, and the heater is provided with a heat medium pipe that connects the heat medium inlet and the heat medium outlet and extends in the vertical direction.

[0014] Preferably, in order to discharge high-concentration liquid and achieve concentration treatment, the concentration outlet is located at the bottom of the heater.

[0015] Preferably, in order to promote the circulation of the feed liquid, the heating inlet is located at the lower part of the side wall of the heater and adjacent to the concentration outlet.

[0016] Preferably, in order to save energy and reduce heating costs, the heat medium inlet is used to introduce the exhaust steam generated by the evaporator concentrator.

[0017] Preferably, in order to achieve the condensation treatment of secondary steam, the condensation assembly includes:

[0018] The condenser has a steam inlet, a non-condensable gas outlet, a condensate outlet, a cooling inlet, and a cooling outlet;

[0019] A condensate tank is connected to the condensate outlet;

[0020] A condensate pump, with its input end connected to the bottom of the condensate tank and its output end connected to the outside;

[0021] The vacuum pump has its input end connected to the non-condensable gas outlet and its output end connected to the outside.

[0022] Preferably, in order to make the device structure compact and reduce the space occupied, the top of the condensate tank is open and fixedly connected to the condensate outlet directly below it.

[0023] Preferably, in order to precisely control the flow of cooling water, the cooling inlet is located below the cooling outlet.

[0024] In summary, compared with the prior art, the degassing concentrator of this utility model heats the liquid feed with a heater, causing the liquid feed to evaporate in the separator, reducing the amount of soluble gas in the liquid feed, thereby reducing corrosion of the evaporation concentrator, extending its service life, and reducing costs. Furthermore, it utilizes the density and temperature differences of the liquid feed to achieve circulation flow, eliminating the need for a circulation pump, saving energy, and further reducing processing costs. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of the degassing concentrator of this utility model;

[0026] In the diagram: 1. Separator; 11. Separation inlet; 12. Separation outlet; 13. Steam outlet; 2. Heater; 21. Heat medium inlet; 22. Heat medium outlet; 23. Heating inlet; 24. Heating outlet; 25. Concentration outlet; 26. Discharge valve; 3. Circulation pipe; 31. Feed inlet; 4. Condenser; 41. Steam inlet; 42. Non-condensable gas outlet; 43. Condensate outlet; 44. Cooling inlet; 45. Cooling outlet; 5. Condensate tank; 6. Condensate pump; 7. Vacuum pump. Detailed Implementation

[0027] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solution of this utility model and should not be construed as limiting the scope of protection of this utility model.

[0028] like Figure 1 As shown, the degassing concentrator of this utility model is used for degassing the feed liquid in an evaporator concentrator, including:

[0029] Separator 1 has a separation inlet 11 and a separation outlet 12 at the bottom, and a steam outlet 13 at the top;

[0030] Heater 2 has a heat medium inlet 21, a heat medium outlet 22, a heating inlet 23, a heating outlet 24 and a concentration outlet 25. The heating outlet 24 is connected to the separation inlet 11 and the concentration outlet 25 is connected to a discharge valve 26.

[0031] The circulation pipe 3 is connected between the separation outlet 12 and the heating inlet 23 and is provided with a feed inlet 31 for inputting the liquid.

[0032] The condenser assembly is used to condense the secondary steam discharged from the steam outlet 13 and then discharge condensate and non-condensable gases.

[0033] In operation, the degassing concentrator of this invention draws liquid from the feed pump and delivers it to the circulation pipe 3 through the feed inlet 31. The circulation pipe 3 then delivers the liquid to be treated to the heater 2. Simultaneously, the heat medium is delivered from the heat medium inlet 21 to the heater 2 to exchange heat with the liquid, causing the temperature of the heat medium to decrease. After condensation, the condensate is discharged through the heat medium outlet 22. After being heated, the liquid temperature rises and the density decreases, flowing upwards to the separator 1. In the separator 1, evaporation occurs, and the secondary steam generated by evaporation is discharged through the steam outlet 13 and condensed by the condensation component. The condensate and non-condensable gases generated after condensation are discharged from the system. After the temperature of the liquid in the separator 1 decreases, it flows again through the circulation pipe 3 to the heater 2 for heating, thus achieving circulating heating. This allows the liquid, with its increased temperature and decreased density, to enter the separator 1 for evaporation and degassing, eliminating soluble gases such as oxygen, carbon dioxide, and hydrogen sulfide from the liquid.

[0034] As the operating time increases, the concentration of the liquid deposited in heater 2 increases, while the gas content in the liquid decreases. At this point, the discharge valve 26 is opened, allowing the solution with increased concentration and reduced gas content to be discharged and fed into the evaporator-concentrator-crystallizer for further concentration. Since the gas content in the liquid is significantly reduced at this time, the corrosiveness of the liquid to the evaporator-concentrator is reduced, extending its service life and thus reducing maintenance and replacement costs. Moreover, during the degassing and concentration process, the liquid achieves natural circulation due to its own density and temperature differences, eliminating the need for an additional circulation pump, simplifying the structure, reducing costs, and reducing the power consumption required for circulation, further reducing the cost of liquid treatment.

[0035] A further improvement is that separator 1 is a horizontal separator 1.

[0036] This design increases the cross-sectional area of ​​separator 1 in the horizontal direction, which facilitates the evaporation of the liquid after heating, promotes degassing, and thus improves the degassing rate.

[0037] A further improvement is that the heating outlet 24 and the circulation pipe 3 are respectively connected to the bottom two ends of the separator 1.

[0038] By setting the connection points of heater 2 and circulation pipe 3 with separator 1 at both ends of the bottom of separator 1, it helps to promote the circulation of liquid in the degassing concentrator.

[0039] A further improvement is that the heater 2 is arranged vertically, and a heat medium pipe is provided inside the heater 2, which connects the heat medium inlet 21 and the heat medium outlet 22 and extends in the vertical direction.

[0040] The heater 2 of this invention adopts a vertical structure, which increases the height of the heater 2. This facilitates the automatic flow of the liquid after it is heated in the heater 2 according to different temperatures and densities. The liquid with higher temperature and lower density flows upward and enters the separator 1 for evaporation, while the liquid with lower temperature and relatively higher density flows downward, thereby promoting the self-circulation of the liquid.

[0041] A further improvement is that the concentration outlet 25 is located at the bottom of the heater 2; the heating inlet 23 is located at the lower part of the side wall of the heater 2 and is adjacent to the concentration outlet 25.

[0042] With the above design, the concentrated liquid can be deposited at the bottom of the heater 2, and the concentrated liquid can be discharged by opening the discharge valve 26. The heating inlet 23 is located at the lower part of the side wall of the heater 2 and is adjacent to the concentration outlet 25, which helps the liquid flowing downward through the circulation pipe 3 to enter the bottom of the heater 2, thereby promoting the circulation of the liquid.

[0043] A further improvement is that the heat transfer medium inlet 21 is used to introduce the exhaust steam generated by the evaporator concentrator.

[0044] By introducing the exhaust steam generated by the evaporator into the heater 2 through the heat medium inlet 21, the feed liquid is heated. Compared with using live steam, the heat energy of the entire evaporator system can be utilized more rationally, saving energy consumption. The feed liquid is preheated in the heater 2 using the exhaust steam generated by the evaporator, and can be heated to about 50 degrees Celsius.

[0045] A further improvement is that the condenser assembly includes:

[0046] The condenser 4 has a steam inlet 41, a non-condensable gas outlet 42, a condensate outlet 43, a cooling inlet 44, and a cooling outlet 45;

[0047] Condensate tank 5 is connected to condensate outlet 43;

[0048] Condensate pump 6 has its input end connected to the bottom of condensate tank 5 and its output end connected to the outside.

[0049] Vacuum pump 7 has its input end connected to non-condensable gas outlet 42 and its output end connected to the outside.

[0050] When the liquid inside separator 1 evaporates, the generated secondary steam contains soluble non-condensable gases such as hydrogen sulfide, oxygen, and carbon dioxide. This secondary steam mixture enters condenser 4 through steam inlet 41. Simultaneously, cooling water enters through cooling inlet 44 and exchanges heat with these high-temperature gases. The cooling water then exits through cooling outlet 45. Upon cooling, the secondary steam in the high-temperature gases condenses, forming condensate, which exits through condensate outlet 43 and falls into condensate tank 5, then is discharged from the system via condensate pump 6. The non-condensable gases are discharged from the system via vacuum pump 7. Furthermore, by pumping air through vacuum pump 7, a negative pressure is created inside separator 1. This negative pressure environment lowers the boiling point of the liquid, allowing it to boil and evaporate at a lower temperature, generating secondary steam containing soluble gases. These soluble gases are then removed by vacuum pump 7. The negative pressure inside separator 1 also creates a pressure difference between different liquid heights inside heater 2. This pressure difference further promotes the circulation of the liquid, thereby saving energy and reducing processing costs.

[0051] A further improvement is that the top of the condensate tank 5 is open and fixedly connected to the condensate outlet 43 directly below it.

[0052] This design makes the condenser assembly structure more compact and reduces the space it occupies.

[0053] A further improvement is that the cooling inlet 44 is located below the cooling outlet 45.

[0054] Thus, when cooling the secondary steam, the cooling inlet 44 flows from bottom to top, which makes it easy to control the flow time of the cooling water in the condenser 4, so as to adjust the heat exchange between the cooling water and the secondary steam.

[0055] In summary, the degassing concentrator of this invention is an evaporation device that combines degassing and material concentration functions. By creating a vacuum environment, it removes volatile components (including dissolved gases and low-boiling-point substances) from the feed liquid, while simultaneously increasing the concentration of the feed liquid. It serves as a pretreatment device for subsequent evaporation, concentration, and crystallization. The feed liquid prepared for evaporation, concentration, and crystallization is thoroughly degassed to remove oxygen, carbon dioxide, hydrogen sulfide, etc. Under vacuum conditions, the degassing rate can reach 65%–83%.

[0056] When the liquid material passes through the degassing concentrator and then enters the evaporation concentrator for evaporation and crystallization, it can significantly reduce corrosion products, lower the frequency of sewage discharge and wastewater treatment costs, while improving the thermal efficiency of the subsequent evaporator and reducing carbon emissions. This allows the evaporation crystallization system to operate safely, efficiently and economically, while meeting environmental protection and compliance requirements.

[0057] This degassing concentrator relies primarily on the density, temperature, and pressure differences of the liquid feed to achieve natural circulation, thus eliminating the need for an additional circulation pump. The heater 2 employs a vertical structure, where the liquid feed is heated to generate secondary steam. This secondary steam, with its reduced density, rises to the separator 1. Under the action of the vacuum pump 7, a system vacuum is maintained to lower the boiling point and reduce heat consumption, allowing evaporation at a lower temperature. The separated liquid feed returns to the heater 2 via the circulation pipe 3, forming a cycle. The condenser 4 condenses the separated secondary steam into liquid, which is collected in the condensate tank 5 and discharged by the condensate pump 6. Therefore, this degassing concentrator offers advantages such as high efficiency and energy saving, no forced circulation pump required, low energy consumption, vacuum environment lowering the boiling point, and heat energy saving. Its simple structure, lack of complex mechanical parts, low maintenance costs, and low failure rate further enhance its advantages.

[0058] The design system of this utility model adopts fully automatic operation control. By controlling the flow rate, temperature, pressure and liquid level, it can achieve automatic evaporation, cleaning, shutdown and alarm operations. It is also equipped with manual valve control for convenient shutdown inspection and maintenance.

[0059] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A degassing concentrator for degassing the feed liquid from an evaporator concentrator, characterized in that, include: The separator has a separation inlet and a separation outlet at the bottom, and a steam outlet at the top. The heater has a heat medium inlet, a heat medium outlet, a heating inlet, a heating outlet, and a concentration outlet. The heating outlet is connected to the separation inlet, and the concentration outlet is connected to a discharge valve. A circulation pipe is connected between the separation outlet and the heating inlet and is provided with a feed port for inputting liquid. The condenser assembly is used to condense the secondary steam discharged from the steam outlet and then discharge condensate and non-condensable gases.

2. The degassing concentrator according to claim 1, characterized in that: The separator is a horizontal separator.

3. The degassing concentrator according to claim 2, characterized in that: The heating outlet and the circulation pipe are respectively connected to the bottom two ends of the separator.

4. The degassing concentrator according to claim 1, characterized in that: The heater is arranged vertically, and a heat medium pipe is provided inside the heater, which connects the heat medium inlet and the heat medium outlet and extends in the vertical direction.

5. The degassing concentrator according to claim 4, characterized in that: The concentration outlet is located at the bottom of the heater.

6. The degassing concentrator according to claim 5, characterized in that: The heating inlet is located at the lower part of the side wall of the heater and is adjacent to the concentration outlet.

7. The degassing concentrator according to claim 1, characterized in that: The heat transfer medium inlet is used to introduce the exhaust steam generated by the evaporator concentrator.

8. The degassing concentrator according to claim 1, characterized in that: The condensation assembly includes: The condenser has a steam inlet, a non-condensable gas outlet, a condensate outlet, a cooling inlet, and a cooling outlet; A condensate tank is connected to the condensate outlet; A condensate pump, with its input end connected to the bottom of the condensate tank and its output end connected to the outside; The vacuum pump has its input end connected to the non-condensable gas outlet and its output end connected to the outside.

9. The degassing concentrator according to claim 8, characterized in that: The top of the condensate tank is open and fixedly connected to the condensate outlet directly below it.

10. The degassing concentrator according to claim 8, characterized in that: The cooling inlet is located below the cooling outlet.

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