Efficient and energy-saving falling film evaporator

Abstract

The utility model discloses an efficient and energy-saving falling film evaporator which comprises an evaporation barrel, an air inlet barrel is fixedly arranged at the upper end of the evaporation barrel, a feeding barrel is fixedly arranged at the upper end of the air inlet barrel, a feeding port is connected to the upper end of the feeding barrel, heat exchange mechanisms are arranged at the two ends of the evaporation barrel, and the heat exchange mechanisms are arranged on the evaporation barrel. And the overall heat exchange efficiency is improved by increasing the contact time of the steam and the heat exchange medium. According to the efficient and energy-saving falling film evaporator, the mode that steam enters the air inlet cylinder, then flows around the upper end of the heated flow guide pipe in the opposite direction and then enters the central pipe to flow out downwards is adopted, so that waste liquid in the heated flow guide pipe at the upper end can be in full contact with the steam, and the heating effect is guaranteed; and the steam in the central pipe moves to the lower end of the central pipe and then is sprayed to the periphery through the exhaust holes, so that the whole device can be uniformly sprayed out at different heights.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical production, in particular to a high-efficiency and energy-saving falling film evaporator. Background Art

[0002] With the continuous development of the nylon industry, the production capacity and product quality of adipic acid, which is the main raw material, have been greatly improved. In the process of adipic acid production, due to the objectivity of the process technology, acidic wastewater containing multiple acids will be produced, among which the inorganic acid is mainly nitric acid, the organic acid is CC, and mixed dibasic acids (the main components are succinic acid, glutaric acid and adipic acid). Mixed dibasic acids can be used as solvents or to produce plasticizers, pesticides, synthetic rubber, foam plastics, etc., and can also be used to prepare mixed dibasic acid esters. As a low-toxic, biodegradable and environmentally friendly solvent, it is widely used in the fields of automobiles and colored steel plate coatings, enameled wires and electrical insulation coatings, especially high-quality mixed dibasic acids. Butanediol, pentanediol and hexanediol can be prepared through catalytic hydrogenation, and its added value will be increased several times. For a long time, adipic acid production enterprises have generally adopted incineration treatment methods. To treat acid-containing wastewater, this method is to atomize the adipic acid waste liquid through a nozzle and send it into an incinerator fueled by heavy oil or natural gas for combustion to decompose the mixed dibasic acid and nitric acid therein. This method not only consumes energy and loses the available effective ingredients, but also causes uncontrollable secondary pollution. Therefore, the nitric acid and water in the adipic acid waste liquid are simply heated and evaporated to separate, and the concentrated mixed dibasic acid is sold, so as to achieve the purpose of controlling the environmental pollution caused by the treatment of adipic acid waste liquid. There are certain harmful substances in the steam generated during the heating and evaporation of the adipic acid waste liquid, and a falling film evaporator is required for closed heating and evaporation. However, since the waste liquid and the steam are not in direct contact when the falling film evaporator is working, the heating rate of the waste liquid is insufficient, resulting in the inability to completely separate the harmful substances and water in the waste liquid. Utility Model Content

[0003] The utility model aims to provide a high-efficiency and energy-saving falling film evaporator to solve the problem of insufficient heating speed of waste liquid proposed in the above background technology.

[0004] To achieve the above-mentioned objectives, the utility model provides the following technical solutions: an efficient and energy-saving falling film evaporator, comprising an evaporating cylinder, an air inlet cylinder is fixedly arranged on the upper end of the evaporating cylinder, a feed cylinder is fixedly arranged on the upper end of the air inlet cylinder, and a feed port is connected to the upper end of the feed cylinder, and heat exchange mechanisms are arranged at both ends of the evaporating cylinder to improve the overall heat exchange efficiency by increasing the contact time between steam and heat exchange medium.

[0005] Preferably, the heat exchange mechanism includes: a heat receiving flow guide pipe, which is fixedly arranged at the lower end of the feed cylinder, and the lower end of the heat receiving flow guide pipe penetrates the outer surface of the air inlet cylinder, and the lower end of the heat receiving flow guide pipe penetrates the inner top surface of the evaporator cylinder, a separation chamber is provided on one side of the evaporator cylinder, and the separation chamber is connected to the evaporator cylinder through a steam pipe and a concentrated liquid pipe, and the upper surface of the separation chamber is connected to a steam outlet, the lower surface of the evaporator cylinder is fixedly provided with a first concentrated liquid outlet, and the lower surface of the separation chamber is fixedly provided with a second concentrated liquid outlet.

[0006] By adopting the above technical solution, the waste liquid can be evaporated by heat during the process of flowing in the heated flow guide pipe, so as to achieve the purpose of separating the waste liquid.

[0007] Preferably, a diverter plate is fixedly arranged in the middle of the inner bottom surface of the feed cylinder, the upper side surface of the air inlet cylinder is connected to a steam inlet, and a center tube is fixedly arranged on the lower surface of the feed cylinder. The interior of the air inlet cylinder is composed of three closed cavities, and a clearance groove is provided at the connection between the two upper closed cavities in the air inlet cylinder, a guide port is provided on the upper side surface of the center tube, an exhaust hole is provided on the side surface of one end of the center tube located in the lowermost cavity of the air inlet cylinder, and a steam exhaust pipe and a condensate exhaust pipe are fixedly connected to the lower side surface of the air inlet cylinder.

[0008] By adopting the above technical solution, the steam can be discharged through the steam discharge pipe after the heat exchange is completed, and the condensed water generated by the steam can be discharged through the condensed water discharge pipe.

[0009] Preferably, the upper end of the heated flow guide pipe penetrates the inner bottom surface of the feed barrel, and the steam pipe is located above the concentrated liquid pipe.

[0010] By adopting the above technical solution, the steam and waste liquid generated by evaporation of the waste liquid can enter the separation chamber through the steam pipe and the concentrated liquid pipe respectively, avoiding the problem of poor steam discharge caused by excessive waste liquid level.

[0011] Preferably, the diverter plate is of a conical design with a small top and a large bottom, and the diverter plate is located directly below the feed inlet.

[0012] By adopting the above technical solution, the diverter plate can evenly distribute the injected waste liquid.

[0013] Preferably, the clearance groove and the guide port are respectively located on both sides of the central tube, and the guide port passes through the upper end side surface of the central tube.

[0014] By adopting the above technical solution, steam can flow inside the upper end of the air inlet cylinder to achieve efficient heating of the upper end of the heat-receiving flow guide pipe.

[0015] Preferably, the exhaust holes are evenly distributed on the lower end side surface of the central tube, and the lower ends of the exhaust holes are sealed and fixedly installed with the upper end of the evaporation cylinder.

[0016] By adopting the above technical solution, the exhaust hole can evenly spray steam to heat the heated flow guide pipe.

[0017] Compared with the prior art, the utility model has the following beneficial effects: the high-efficiency and energy-saving falling film evaporator:

[0018] 1. The steam enters the air inlet cylinder, flows around the upper end of the heated flow guide tube, and then enters the central tube and flows downward, so that the waste liquid inside the upper heated flow guide tube can be fully heated by full contact with the steam, so that the harmful substances in the waste liquid can be fully separated from the water;

[0019] 2. Furthermore, by moving the steam in the central tube to the lower end of the central tube and then spraying it to the surroundings through the exhaust holes, the steam can be sprayed evenly at different heights, ensuring that the steam temperature at each height is the same, ensuring uniform heating of the waste liquid, and avoiding uneven heating of the waste liquid caused by natural cooling during the flow process under distillation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the utility model;

[0021] Figure 2 It is a schematic diagram of the three-dimensional structure of the overall cutaway surface of the utility model;

[0022] Figure 3 This is a three-dimensional structural schematic diagram of the evaporation cylinder, steam pipeline and concentrated liquid pipeline connection section of the utility model;

[0023] Figure 4 This is a schematic diagram of the three-dimensional structure of the connection between the air intake cylinder and the steam inlet of the utility model;

[0024] Figure 5 It is a three-dimensional structural schematic diagram of the cross-section surface connecting the central tube and the guide port of the utility model;

[0025] Figure 6 It is a three-dimensional structural schematic diagram of the cross-section surface connecting the central tube and the exhaust hole of the utility model.

[0026] In the figure: 1. evaporation cylinder; 2. air inlet cylinder; 3. feed cylinder; 4. feed inlet; 5. heat-receiving flow guide tube; 6. separation chamber; 7. steam pipe; 8. concentrate pipe; 9. steam outlet; 10. first concentrate outlet; 11. second concentrate outlet; 12. diverter plate; 13. steam inlet; 14. center tube; 15. clearance groove; 16. flow guide port; 17. exhaust hole; 18. steam discharge pipe; 19. condensate discharge pipe. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] See also Figure 1-6 The utility model provides a technical solution: a high-efficiency and energy-saving falling film evaporator.

[0029] Embodiment 1

[0030] The embodiment discloses: an evaporating cylinder 1, an air inlet cylinder 2 is fixedly arranged at the upper end of the evaporating cylinder 1, and a material inlet cylinder 3 is fixedly arranged at the upper end of the air inlet cylinder 2, and a material inlet port 4 is connected to the upper end of the material inlet cylinder 3, and heat exchange mechanisms are arranged at both ends of the evaporating cylinder 1, so as to improve the overall heat exchange efficiency by increasing the contact time between steam and heat exchange medium;

[0031] The heat exchange mechanism includes: a heat receiving flow guide pipe 5, which is fixedly arranged at the lower end of the feed cylinder 3, and the lower end of the heat receiving flow guide pipe 5 penetrates the outer surface of the air intake cylinder 2, and the lower end of the heat receiving flow guide pipe 5 penetrates the inner top surface of the evaporation cylinder 1, a separation chamber 6 is arranged on one side of the evaporation cylinder 1, and the separation chamber 6 is connected to the evaporation cylinder 1 through a steam pipe 7 and a concentrated liquid pipe 8, and the upper surface of the separation chamber 6 is connected to a steam outlet 9, the lower surface of the evaporation cylinder 1 is fixedly installed with a first concentrated liquid outlet 10, and the lower surface of the separation chamber 6 is fixedly installed with a second concentrated liquid outlet 11;

[0032] The upper end of the heat-receiving flow-conducting pipe 5 penetrates the inner bottom surface of the feeding barrel 3, and the steam pipe 7 is located above the concentrated liquid pipe 8;

[0033] During operation, waste liquid enters the feed cylinder 3 through the feed port 4, and then enters the interior of the heat receiving flow guide tube 5. The waste liquid is heated and evaporated during the flow in the heat receiving flow guide tube 5. At this time, the waste liquid enters the evaporation cylinder 1 through the lower end of the heat receiving flow guide tube 5, and the steam enters the separation chamber 6 through the steam pipe 7 and is finally discharged upward through the steam outlet 9. After the evaporation is completed, the residual waste liquid inside the evaporation cylinder 1 is discharged downward by opening the first concentrated liquid outlet 10. When too much waste liquid in the evaporation cylinder 1 enters the separation chamber 6 through the concentrated liquid pipe 8, the second concentrated liquid outlet 11 is opened to discharge the residual waste liquid and condensed water.

[0034] Embodiment 2

[0035] This embodiment is disclosed on the basis of the embodiment 1: a diverter plate 12 is fixedly arranged in the middle of the inner bottom surface of the feed cylinder 3, a steam inlet 13 is connected to the upper side surface of the air intake cylinder 2, a center tube 14 is fixedly arranged on the lower surface of the feed cylinder 3, the interior of the air intake cylinder 2 is three closed cavities, and a clearance groove 15 is provided at the connection of the two closed cavities located at the upper part of the air intake cylinder 2, a flow guide port 16 is provided on the upper side surface of the center tube 14, an exhaust hole 17 is provided on the side surface of one end of the center tube 14 located in the lowermost cavity of the air intake cylinder 2, and a steam exhaust pipe 18 and a condensed water exhaust pipe 19 are fixedly connected to the lower side surface of the air intake cylinder 2;

[0036] The diverter plate 12 is a conical design with a small top and a large bottom, and the diverter plate 12 is located directly below the feed inlet 4;

[0037] The clearance groove 15 and the guide port 16 are respectively located on both sides of the central tube 14, and the guide port 16 passes through the upper end side surface of the central tube 14;

[0038] The exhaust holes 17 are evenly distributed on the lower side surface of the central tube 14, and the lower ends of the exhaust holes 17 are sealed and fixedly installed with the upper end of the evaporation cylinder 1;

[0039] The waste liquid injected into the feeding cylinder 3 passes through the conical diversion plate 12 and then evenly enters the heated flow guide tube 5 and flows downward. At this time, steam is injected into the cavity in the middle section of the air intake cylinder 2 through the steam inlet 13, and the steam passes through the give way groove 15 and upwardly enters the cavity in the upper section of the air intake cylinder 2. The steam heats the waste liquid in the heated flow guide tube 5 during the flow process, and finally the steam enters the center tube 14 through the diversion port 16 and flows downward. Then the center tube 14 sprays the steam downward into the cavity in the lower section of the air intake cylinder 2 through the exhaust hole 17 at the lower end to further heat the waste liquid in the heated flow guide tube 5. The heated steam is discharged through the steam exhaust pipe 18, and the condensed water generated by the steam is discharged through the condensed water exhaust pipe 19.

[0040] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-efficiency and energy-saving falling film evaporator, comprising an evaporation cylinder (1), an air intake cylinder (2) being fixedly arranged at the upper end of the evaporation cylinder (1), a material feed cylinder (3) being fixedly arranged at the upper end of the air intake cylinder (2), and a material feed port (4) being connected to the upper end of the material feed cylinder (3), characterized in that: The two ends of the evaporating cylinder (1) are provided with heat exchange mechanisms, which improve the overall heat exchange efficiency by increasing the contact time between steam and heat exchange medium; The heat exchange mechanism comprises: a heat receiving flow guide pipe (5), the heat receiving flow guide pipe (5) is fixedly arranged at the lower end of the feed cylinder (3), and the lower end of the heat receiving flow guide pipe (5) penetrates the outer surface of the air intake cylinder (2), and the lower end of the heat receiving flow guide pipe (5) penetrates the inner top surface of the evaporation cylinder (1), a separation chamber (6) is arranged on one side of the evaporation cylinder (1), and the separation chamber (6) is connected to the evaporation cylinder (1) through a steam pipe (7) and a concentrated liquid pipe (8), and the upper surface of the separation chamber (6) is connected to a steam outlet (9), the lower surface of the evaporation cylinder (1) is fixedly installed with a first concentrated liquid outlet (10), and the lower surface of the separation chamber (6) is fixedly installed with a second concentrated liquid outlet (11).

2. The high-efficiency and energy-saving falling film evaporator according to claim 1, characterized in that: A diverter plate (12) is fixedly arranged in the middle of the inner bottom surface of the feed cylinder (3); the upper side surface of the air intake cylinder (2) is connected to a steam inlet (13); the lower surface of the feed cylinder (3) is fixedly arranged with a center tube (14); the interior of the air intake cylinder (2) is composed of three closed cavities, and a clearance groove (15) is provided at the connection between the two upper closed cavities in the air intake cylinder (2); the upper side surface of the center tube (14) is provided with a guide port (16); the side surface of one end of the center tube (14) located in the lowermost cavity of the air intake cylinder (2) is provided with an exhaust hole (17); the lower side surface of the air intake cylinder (2) is fixedly connected with a steam exhaust pipe (18) and a condensate exhaust pipe (19).

3. The high-efficiency and energy-saving falling film evaporator according to claim 1, characterized in that: The upper end of the heat-receiving flow-conducting pipe (5) penetrates the inner bottom surface of the feeding barrel (3), and the steam pipe (7) is located above the concentrated liquid pipe (8).

4. The high-efficiency and energy-saving falling film evaporator according to claim 2, characterized in that: The diverter plate (12) is of a conical design with a small top and a large bottom, and the diverter plate (12) is located directly below the feed inlet (4).

5. The high-efficiency and energy-saving falling film evaporator according to claim 2, characterized in that: The clearance groove (15) and the flow guide port (16) are respectively located on both sides of the central tube (14), and the flow guide port (16) penetrates the upper end side surface of the central tube (14).

6. The high-efficiency and energy-saving falling film evaporator according to claim 2, characterized in that: The exhaust holes (17) are evenly distributed on the lower end side surface of the central tube (14), and the lower ends of the exhaust holes (17) are sealed and fixedly mounted to the upper end of the evaporation cylinder (1).

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