Ethanol evaporation device in acetaldehyde synthesis

Abstract

The utility model discloses an ethanol evaporation device in acetaldehyde synthesis, which belongs to the technical field of chemical synthesis and comprises an ethanol heating tank, an ethanol preheater and a spray vaporization device. The ethanol evaporator can solve the problems that an existing ethanol evaporator is low in evaporation efficiency and large in steam consumption, and due to the fact that ethanol is continuously fed and evaporated in the evaporator, some impurities are accumulated at the bottom, equipment use and oxidation reaction are affected to a certain extent, the service life of evaporator equipment is affected, and steam unit consumption for acetaldehyde production is also increased. The ethanol is atomized and reheated, so that the heat exchange contact area is increased, the heat efficiency is improved, the ethanol is vaporized thoroughly, the heated steam continuously enters the ethanol heating tank to preheat the ethanol, the heat energy of the steam is recycled, and the steam condensation drain water can be used as a heating medium source of the ethanol preheater. Recycling of surplus heat energy is achieved, steam consumption of ethanol evaporation is greatly reduced, and the ethanol evaporation efficiency can be effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical synthesis, in particular to an ethanol evaporation device in acetaldehyde synthesis. Background Art

[0002] Acetaldehyde is an important basic chemical raw material, mainly used in the production of acetic acid, acetic anhydride, crotonaldehyde, polyacetaldehyde, etc. It is also widely used in the fields of medicine, food additives, etc. At present, the domestic production of acetaldehyde mainly adopts the ethanol oxidation method, using ethanol and air as raw materials, and an oxidation reaction occurs under the action of a catalyst to produce acetaldehyde. The raw material ethanol generally enters the oxidizer by bubbling evaporation, which is of great significance to the research on ethanol evaporation equipment.

[0003] The existing ethanol evaporator has low evaporation efficiency and high steam consumption. In addition, ethanol is continuously fed and evaporated in the evaporator, causing some impurities to accumulate at the bottom, which has a certain impact on the use of the equipment and the oxidation reaction, increases the load of the evaporator, affects the service life of the evaporator equipment, and also increases the steam consumption per unit for producing acetaldehyde. Utility Model Content

[0004] The utility model aims to provide an ethanol evaporation device in acetaldehyde synthesis, which increases the heat exchange contact area and improves the thermal efficiency by atomizing and reheating ethanol, so that ethanol is completely vaporized, and the heated steam continues to enter the ethanol heating tank to preheat the ethanol, thereby realizing the reuse of the heat energy of the steam, and the steam condensation drain can be used as a heat medium source for the ethanol preheater, thereby realizing the recovery and utilization of surplus heat energy, greatly reducing the steam consumption of ethanol evaporation, effectively improving the ethanol evaporation efficiency, and solving the problems in the prior art.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] An ethanol evaporation device in acetaldehyde synthesis comprises an ethanol heating tank, an ethanol preheater and a spray vaporization device, wherein a first steam inlet arranged in the middle of the ethanol heating tank is connected to a steam outlet arranged on the spray vaporization device;

[0007] The ethanol delivery pipe of the ethanol heating tank is provided with a first filter and a second filter, both of which are connected to the feed port of the ethanol feed pump, and the discharge port of the ethanol feed pump is connected to an ethanol preheater and a spray vaporization device.

[0008] Preferably, a liquid level gauge is provided on the ethanol heating tank, a first heat exchange tube is provided in the middle part of the ethanol heating tank, a steam condensation drain outlet and a mixed ethanol inlet are provided in the middle part of the ethanol heating tank, a tank bottom displacement pump is provided at the bottom of the ethanol heating tank, the liquid level gauge is higher than the top of the first heat exchange tube, and the liquid level gauge is higher than the mixed ethanol inlet and the first steam inlet.

[0009] Preferably, the discharge port of the ethanol feed pump is connected to an ethanol flow regulating valve and an ethanol inlet arranged on an ethanol preheater, the ethanol flow regulating valve is controlled by an intelligent controller, an air inlet is arranged at the top of the spray vaporization device, and a mixed gas outlet is arranged at the bottom of the spray vaporization device.

[0010] Preferably, the ethanol preheater is provided with a heat medium inlet and a heat medium outlet, wherein the heat medium source is the steam condensate drain discharged from the steam condensate drain outlet provided on the ethanol heating tank, and the ethanol preheater is also provided with an ethanol outlet, and the ethanol outlet is connected to the ethanol heating tank.

[0011] Preferably, the shell side of the first heat exchange tubes is steam, and the tube side is ethanol.

[0012] Preferably, a second heat exchange tube is provided in the middle part of the spray vaporization device, a second steam inlet is provided in the middle part of the spray vaporization device, an outer circle nozzle pipe and an inner circle nozzle pipe are provided on the inner side of the spray vaporization device, atomizing nozzles are provided on the outer circle nozzle pipe and the inner circle nozzle pipe, the radius of the outer circle nozzle pipe is 2 / 3 of the radius of the spray vaporization device, and the radius of the inner circle nozzle pipe is 1 / 3 of the radius of the spray vaporization device, wherein the outer circle nozzle pipe and the inner circle nozzle pipe are evenly arranged with downward atomizing nozzles.

[0013] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0014] The utility model increases the heat exchange contact area and improves the thermal efficiency by atomizing and reheating the ethanol, so that the ethanol is completely vaporized. The heated steam continues to enter the ethanol heating tank to preheat the ethanol, thereby realizing the reuse of the thermal energy of the steam. The steam condensation drain can be used as a heat medium source for the ethanol preheater, thereby realizing the recovery and utilization of surplus thermal energy, greatly reducing the steam consumption of ethanol evaporation, and effectively improving the ethanol evaporation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of the ethanol high-efficiency evaporation device of the utility model;

[0016] Figure 2 It is a cross-sectional top view of an atomizing nozzle arranged in the spray vaporization device of the utility model.

[0017] In the figure: 1. ethanol heating tank; 11. liquid level gauge; 12. first heat exchange tube; 13. first steam inlet; 14. steam condensate drain outlet; 15. tank bottom displacement pump; 16. mixed ethanol inlet; 2. ethanol preheater; 21. heat medium inlet; 22. heat medium outlet; 23. ethanol inlet; 24. ethanol outlet; 3. spray vaporization device; 31. second heat exchange tube; 32. atomizing nozzle; 33. second steam inlet; 34. steam outlet; 35. outer ring nozzle pipeline; 36. inner ring nozzle pipeline; 4. first filter; 5. second filter; 6. ethanol feed pump; 7. ethanol flow regulating valve; 8. intelligent controller; 9. air inlet; 10. mixed gas outlet. DETAILED DESCRIPTION

[0018] 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.

[0019] In order to solve the technical problems of low evaporation efficiency and high steam consumption of the existing ethanol evaporator, and the continuous evaporation of ethanol in the evaporator, which causes some impurities to accumulate at the bottom, has a certain impact on the use of the equipment and the oxidation reaction, increases the load of the evaporator, affects the service life of the evaporator equipment, and also increases the steam consumption of acetaldehyde production, please refer to Figure 1-Figure 2 , this embodiment provides the following technical solutions:

[0020] An ethanol evaporation device in acetaldehyde synthesis comprises an ethanol heating tank 1, an ethanol preheater 2 and a spray vaporization device 3. A first heat exchange tube 12 is arranged in the middle part of the ethanol heating tank 1. The shell side of the first heat exchange tube 12 is steam and the tube side is ethanol. A steam condensation drain outlet 14 and a mixed ethanol inlet 16 are arranged in the middle part of the ethanol heating tank 1. A tank bottom displacement pump 15 is arranged at the bottom of the ethanol heating tank 1.

[0021] It should be noted that by arranging a tank bottom displacement pump 15 at the bottom of the ethanol heating tank 1 , wherein the inlet of the tank bottom displacement pump 15 is at the lowest point of the ethanol heating tank 1 , it is beneficial to discharge impurities.

[0022] The first steam inlet 13 provided in the middle of the ethanol heating tank 1 is connected to the steam outlet 34 provided on the spray vaporization device 3. The ethanol heating tank 1 is provided with a liquid level gauge 11, which is higher than the top of the first heat exchange tube 12, and the liquid level gauge 11 is higher than the mixed ethanol inlet 16 and the first steam inlet 13.

[0023] A first filter 4 and a second filter 5 are provided on the ethanol delivery pipe of the ethanol heating tank 1 .

[0024] It should be noted that the first filter 4 and the second filter 5 are provided as a backup for easy replacement and cleaning.

[0025] The first filter 4 and the second filter 5 are both connected to the feed port of the ethanol feed pump 6 , and the discharge port of the ethanol feed pump 6 is connected to the ethanol flow regulating valve 7 and the ethanol inlet 23 provided on the ethanol preheater 2 .

[0026] It should be noted that the outlet of the ethanol feed pump 6 is divided into two paths, one part of the ethanol enters the ethanol preheater 2 for preheating, and the other part of the ethanol enters the spray vaporization device 3 for vaporization after passing through the ethanol flow regulating valve 7.

[0027] The ethanol flow regulating valve 7 is controlled by the intelligent controller 8, and the feed flow rate can be adjusted according to the production automation;

[0028] The ethanol preheater 2 is also provided with an ethanol outlet 24, and the ethanol outlet 24 is connected to the ethanol heating tank 1;

[0029] The ethanol preheater 2 is provided with a heat medium inlet 21 and a heat medium outlet 22, wherein the heat medium source is the steam condensate drain discharged from the steam condensate drain outlet 14 provided on the ethanol heating tank 1, which can realize the recovery and utilization of heat energy.

[0030] An air inlet 9 is provided at the top of the spray vaporization device 3, a mixed gas outlet 10 is provided at the bottom of the spray vaporization device 3, a second heat exchange tube 31 is provided in the middle part of the spray vaporization device 3, a second steam inlet 33 is provided in the middle part of the spray vaporization device 3, an outer ring nozzle pipeline 35 and an inner ring nozzle pipeline 36 are provided on the inner side of the spray vaporization device 3, and atomizing nozzles 32 are provided on both the outer ring nozzle pipeline 35 and the inner ring nozzle pipeline 36.

[0031] The radius of the outer ring nozzle pipeline 35 is 2 / 3 of the radius of the spray vaporization device 3, and the radius of the inner ring nozzle pipeline 36 is 1 / 3 of the radius of the spray vaporization device 3, wherein the outer ring nozzle pipeline 35 and the inner ring nozzle pipeline 36 are evenly arranged with downward atomizing nozzles 32.

[0032] It should be noted that the outer circle nozzle pipe 35 and the inner circle nozzle pipe 36 are concentric circle pipes, and eight atomizing nozzles 32 are arranged on the outer circle nozzle pipe 35 and the inner circle nozzle pipe 36, and the angle between adjacent atomizing nozzles 32 and the line connecting the center of the circle is 45 degrees, and the angle between the atomizing nozzle 32 closest to the outer circle nozzle pipe 35 and the inner circle nozzle pipe 36 and the line connecting the center of the circle is 22.5 degrees, so that the atomized mist ethanol is distributed more evenly and evenly enters the second heat exchange tube array 31 driven by air.

[0033] Working principle: The middle part of the ethanol heating tank 1 is provided with a first heat exchange tube 12, steam enters the shell side from the first steam inlet 13, mixed ethanol enters the ethanol heating tank 1 from the mixed ethanol inlet 16, and ethanol preheated by the ethanol preheater 2 enters the ethanol heating tank 1 from the ethanol outlet 24. The ethanol is heated by steam inside the tube side of the first heat exchange tube 12, and the steam condensate drain after heat exchange is discharged and collected from the steam condensate drain outlet 14. A tank bottom displacement pump 15 is provided at the bottom of the ethanol heating tank 1 to extract impurities accumulated at the bottom of the tank;

[0034] The ethanol feed pump 6 delivers the heated ethanol to the spray vaporization device 3 and the ethanol preheater 2. A first filter 4 and a second filter 5 are arranged before the inlet of the ethanol feed pump 6 to filter out foreign particles and prevent the atomizing nozzle 32 from being blocked. When in use, the first filter 4 and the second filter 5 are in a standby state, which is convenient for replacement and cleaning at any time.

[0035] Among them, part of the ethanol delivered by the ethanol feed pump 6 enters the ethanol preheater 2 for preheating, and part enters the spray vaporization device 3. Before entering the spray vaporization device 3, an ethanol flow regulating valve 7 and an intelligent controller 8 are provided. A certain feed flow rate can be set as needed, and the ethanol flow regulating valve 7 completes the regulation;

[0036] Among them, the preheated ethanol enters the spray vaporization device 3, and is sprayed out through the atomizing nozzle 32 under the action of the ethanol liquid pressure in the pipeline to form small mist droplets. Air enters the spray vaporization device 3 from the air inlet 9, and the mist ethanol enters the tube side of the second heat exchange tube 31 driven by the air. Steam enters the shell side of the second heat exchange tube 31 from the second steam inlet 33 to heat the air and ethanol, so that they are vaporized and reach a certain temperature, and then enter the reactor from the mixed gas outlet 10 for reaction.

[0037] Therefore, by atomizing and reheating ethanol, the heat exchange contact area is increased, the thermal efficiency is improved, and the ethanol is completely vaporized. The heated steam continues to enter the ethanol heating tank 1 to preheat the ethanol, thereby realizing the reuse of the steam's thermal energy. The steam condensation drain can be used as a heat medium source for the ethanol preheater 2, thereby realizing the recovery and utilization of surplus thermal energy, greatly reducing the steam consumption of ethanol evaporation, and effectively improving the ethanol evaporation efficiency.

[0038] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0039] Although embodiments of the present invention have been shown and described, it will be appreciated 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 that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An ethanol evaporation device for acetaldehyde synthesis, comprising an ethanol heating tank (1), an ethanol preheater (2) and a spray vaporization device (3), characterized in that: A first steam inlet (13) arranged in the middle of the ethanol heating tank (1) is connected to a steam outlet (34) arranged on the spray vaporization device (3); a first filter (4) and a second filter (5) are arranged on the ethanol delivery pipe of the ethanol heating tank (1); the first filter (4) and the second filter (5) are both connected to the feed port of the ethanol feed pump (6); and the discharge port of the ethanol feed pump (6) is connected to the ethanol preheater (2) and the spray vaporization device (3).

2. The ethanol evaporation device in acetaldehyde synthesis according to claim 1, characterized in that: The ethanol heating tank (1) is provided with a liquid level gauge (11), the middle part of the ethanol heating tank (1) is provided with a first heat exchange tube (12), the middle part of the ethanol heating tank (1) is provided with a steam condensation drain outlet (14) and a mixed ethanol inlet (16), the bottom of the ethanol heating tank (1) is provided with a tank bottom displacement pump (15), the liquid level gauge (11) is higher than the top of the first heat exchange tube (12), and the liquid level gauge (11) is higher than the mixed ethanol inlet (16) and the first steam inlet (13).

3. The ethanol evaporation device in acetaldehyde synthesis according to claim 1, characterized in that: The discharge port of the ethanol feed pump (6) is connected to an ethanol flow regulating valve (7) and an ethanol inlet (23) provided on the ethanol preheater (2); the ethanol flow regulating valve (7) is controlled by an intelligent controller (8); an air inlet (9) is provided at the top of the spray vaporization device (3); and a mixed gas outlet (10) is provided at the bottom of the spray vaporization device (3).

4. The ethanol evaporation device in acetaldehyde synthesis according to claim 2, characterized in that: The ethanol preheater (2) is provided with a heat medium inlet (21) and a heat medium outlet (22), wherein the heat medium source is the steam condensate drain discharged from the steam condensate drain outlet (14) provided on the ethanol heating tank (1), and the ethanol preheater (2) is also provided with an ethanol outlet (24), and the ethanol outlet (24) is connected to the ethanol heating tank (1).

5. The ethanol evaporation device in acetaldehyde synthesis according to claim 2, characterized in that: The shell side of the first heat exchange tube (12) is steam, and the tube side is ethanol.

6. The ethanol evaporation device in acetaldehyde synthesis according to claim 1, characterized in that: A second heat exchange tube (31) is provided in the middle of the spray vaporization device (3), a second steam inlet (33) is provided in the middle of the spray vaporization device (3), an outer ring nozzle pipe (35) and an inner ring nozzle pipe (36) are provided on the inner side of the spray vaporization device (3), atomizing nozzles (32) are provided on both the outer ring nozzle pipe (35) and the inner ring nozzle pipe (36), the radius of the outer ring nozzle pipe (35) is 2 / 3 of the radius of the spray vaporization device (3), and the radius of the inner ring nozzle pipe (36) is 1 / 3 of the radius of the spray vaporization device (3), wherein downward atomizing nozzles (32) are evenly arranged on the outer ring nozzle pipe (35) and the inner ring nozzle pipe (36).

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