A segmented energy-saving heat exchanger and heat exchange method for a three-tower distillation system

Abstract

The present invention discloses a segmented energy-saving heat exchanger for a three-tower distillation system, comprising a steam production system, a pressurizing tower, a pre-tower, a first reboiler, a second reboiler, a segmented heat exchanger and a steam condensate recovery system. The present invention also discloses a heat exchange method for a segmented energy-saving heat exchanger for a three-tower distillation system. The invention uses a segmented heat exchanger to realize the heat recovery of the steam condensate of the first reboiler, thereby achieving the energy-saving effect of saving steam for the second reboiler. At the same time, the steam condensate recovery system can quickly guide the steam and accelerate the steam so that the steam is accelerated to flow to the condensation component for condensation, thereby accelerating the condensation efficiency and quickly recovering the condensate.

Description

Technical Field

[0001] The invention relates to heat exchange technology, and in particular to a sectional energy-saving heat exchanger and a heat exchange method for a three-tower distillation system. Background Art

[0002] This industry has always used external steam heat sources to control the temperature in the distillation tower through reboilers. Each reboiler needs to be equipped with an external heat source, resulting in high steam consumption in the distillation process. The traditional process flow is that 1.0MPa steam provides heating heat source for the pressure tower through the first reboiler, and 1.0MPa steam provides heating heat source for the pre-tower through the third reboiler. The two heated steam condensates directly enter the steam condensate system. Due to the requirements of process conditions, the condensate temperature coming out of the first reboiler is as high as 112℃, and there is insufficient heat utilization, resulting in high steam consumption in the three-tower distillation system. Summary of the invention

[0003] In order to solve the defects of the prior art mentioned above, the present invention proposes a segmented energy-saving heat exchanger and a heat exchange method for a three-tower distillation system.

[0004] The technical solution of the present invention is achieved in this way:

[0005] A sectional energy-saving heat exchanger for a three-tower distillation system, characterized in that it comprises: a steam production system, a pressurizing tower, a pre-tower, a first reboiler, a second reboiler, a sectional heat exchanger and a steam condensate recovery system, wherein the steam production system is connected to the first reboiler and the second reboiler respectively, the first reboiler is simultaneously connected to the pressurizing tower, the steam condensate recovery system and the sectional heat exchanger, the sectional heat exchanger is located at the upper end of the second reboiler, the sectional heat exchanger and the second reboiler are connected to the steam condensate recovery system, the pre-tower is connected to the second reboiler and the sectional heat exchanger respectively, wherein

[0006] The steam condensate recovery system is composed of a condensate tank, a guide member and a condensation assembly. The guide member and the condensation assembly are both installed in the condensate tank. One end of the guide member is an air inlet, and the other end is an exhaust port. There are multiple guide plates in the middle. A steam channel is formed between the guide plate and the guide member. The exhaust port faces the condensation assembly.

[0007] The condensation assembly consists of a liquid inlet pipe, a liquid outlet pipe, a support and multiple condensation plates. The support is arranged on both sides of the condensation plate. The interior of the condensation plate is hollow and one end is connected to the liquid inlet pipe, and the other end is connected to the liquid outlet pipe. The openings between the multiple condensation plates are larger at one end facing the guide member and smaller at the other end, and are arranged at an angle.

[0008] In the present invention, an acceleration recess and a guide protrusion extending toward the acceleration recess are provided at the air inlet and the steam channel.

[0009] In the present invention, the guide plates are in an "S" shape, and the ends are interlocked to form a guide channel.

[0010] In the present invention, the guide plate includes a first protrusion and a second protrusion, the first protrusion faces the steam channel, the second protrusion faces the condensation assembly, the first protrusion is provided with a blocking portion, and the second protrusion is provided with a converging protrusion.

[0011] In the present invention, a plurality of first condensation holes are provided on the condensation plate.

[0012] In the present invention, the difference in inclination angles between the condensation plates is 5°.

[0013] In the present invention, a partition is further provided in the condensate tank, and the partition is located at the rear end of the condensation assembly. The middle of the partition is hollowed out, and the lower end is connected to the liquid inlet pipe, and the upper end is connected to the liquid outlet pipe.

[0014] In the present invention, the partition is provided with a plurality of second condensation holes, and the second condensation holes are arranged to be inclined downward.

[0015] A heat exchange method for a sectional energy-saving heat exchanger in a three-tower distillation system, characterized in that it comprises the following steps:

[0016] S1, 1.0MPa 205℃ steam passes through the first reboiler, then is absorbed by the pressure tower, the temperature drops to 112℃, and is heated by the sectional heat exchanger of the heating pre-tower;

[0017] S2, the steam condensate with a temperature of 75-80°C coming out of the sectional heat exchanger of the heating pre-tower enters the steam condensate recovery system;

[0018] S3: The steam condensate outlet of the first reboiler enters the sectional heat exchanger, and then mixes with the steam condensate outlet of the second reboiler and enters the steam condensate recovery system for condensation and recovery.

[0019] The sectional energy-saving heat exchanger for the three-tower distillation system of the present invention has the following beneficial effects: the invention uses a sectional heat exchanger to realize the heat recovery of the steam condensate in the first reboiler, thereby saving the steam for the second reboiler. At the same time, the steam condensate recovery system can quickly guide the steam and accelerate the steam, so that the steam flows to the condensation component to condense, the condensation efficiency is accelerated, and the condensate is quickly recovered. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The flow chart of the sectional energy-saving heat exchanger of the three-tower distillation system of the present invention;

[0021] Figure 2 for Figure 1 Schematic diagram of the structure of the sectional heat exchanger in FIG.

[0022] Figure 3 It is a schematic diagram of the structure of the steam condensate recovery system in the present invention;

[0023] Figure 4 for Figure 3 sectional view of

[0024] Figure 5 for Figure 4 A local enlarged view of point A in FIG.

[0025] Figure 6 for Figure 3 Schematic diagram of the internal structure;

[0026] Figure 7 for Figure 6 Schematic diagram of the condensation component structure;

[0027] Figure 8 for Figure 6 Cross-sectional view of the guide structure.

[0028] In the figure: steam production system 1, pressure tower 2, pre-tower 3, first reboiler 4, second reboiler 5, sectional heat exchanger 6, steam condensate recovery system 7, cylinder 8, baffle 9, condensate box 10, guide member 11, condensation assembly 12, cover plate 13, condensation area 14, heat exchange area 15, liquid storage area 16, partition 17, liquid inlet pipe 18, liquid outlet pipe 19, second condensation hole 20, notch 21, gas storage area 22, installation port 23, exhaust port 24, air inlet 25, condensation plate 26, drain pipe 27, guide plate 28, steam channel 29, acceleration recess 30, guide protrusion 31, drainage channel 32, first protrusion 33, second protrusion 34, blocking portion 35, converging protrusion 36, support 37, branch pipe 38, first condensation hole 39, installation protrusion 40, air outlet 41. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0030] like Figures 1 to 8As shown, the sectional energy-saving heat exchanger for the three-tower distillation system of the present invention comprises: a steam production system 1, a pressurizing tower 2, a pre-tower 3, a first reboiler 4, a second reboiler 5, a sectional heat exchanger 6 and a steam condensate recovery system 7. The steam production system 1 is connected to the first reboiler 4 and the second reboiler 5 respectively, the first reboiler 4 is connected to the pressurizing tower 2, the steam condensate recovery system 7 and the sectional heat exchanger 6 at the same time, the upper end of the first reboiler 4 is connected to the middle of the pressurizing tower 2, the lower end of the first reboiler 4 is connected to the lower end of the pressurizing tower 2, and the lower end is also connected to the steam condensate recovery system 7. The sectional heat exchanger 6 is at the upper end of the second reboiler 5, the sectional heat exchanger 6 and the second reboiler 5 are connected to the steam condensate recovery system 7, and the pre-tower 3 is connected to the second reboiler 5 and the sectional heat exchanger 6 respectively. The upper end of the sectional heat exchanger 6 is connected to the middle of the pre-tower 3, the lower end of the second reboiler 5 is connected to the lower end of the pre-tower 3, and switches are provided on each connecting pipe. The upper and lower ends of the sectional heat exchanger 6 are respectively connected to the steam condensate recovery system 7 through pipes, and switches are provided on the pipes, and the drainage can be separated by the switches.

[0031] The segmented heat exchanger 6 includes an exhaust hole N1, a cylinder 8, a shell-side pipe N2, a shell-side pipe N3 and an exhaust port N4, wherein the shell-side pipe N2 is an outlet and the shell-side pipe N3 is an inlet. A baffle 9 can be arranged inside the cylinder 8. The baffle 9 plays a role of supporting the heat transfer tube on the one hand, and can guide the fluid in the cylinder 8 to move up and down on the other hand, thereby increasing the heat exchange stroke of the two liquids and improving the heat exchange efficiency.

[0032] The purpose of setting the exhaust port N4 is to facilitate the discharge of the residual fluid in the cylinder 8 when the sectional heat exchanger 6 is not in use. The purpose of setting the exhaust hole N1 is to prevent the residual gas in the cylinder 8 from reducing the flow rate of the fluid in the cylinder 8, resulting in reduced heat exchange efficiency.

[0033] The steam condensate recovery system 7 is composed of a condensate tank 10, a flow guide 11 and a condensation assembly 12, and the flow guide 11 and the condensation assembly 12 are both installed in the condensate tank 10. A cover plate 13 is provided at the upper end of the condensate tank 10, and when the cover plate 13 is opened, the flow guide 11 and the condensation assembly 12 can be installed in the condensate tank 10. A condensation area 14 is formed between the flow guide 11 and the condensation assembly 12, the condensation assembly 12 is located in a heat exchange area 15, and a liquid storage area 16 is provided at the lower end of the condensate tank 10.

[0034] At the same time, a partition 17 is provided inside the condensate tank 10. The partition 17 is located at the rear end of the condensation assembly 12. The middle of the partition 17 is hollowed out, and the lower end is connected to the liquid inlet pipe 18, and the upper end is connected to the liquid outlet pipe 19. The partition 17 has multiple second condensation holes 20, which are arranged to be inclined downward. One end of the second condensation hole 20 faces downward toward the heat exchange area 15, and the other end faces upward, so that the condensed water droplets can flow into the liquid storage area 16. A notch 21 is provided at the lower end of the partition 17, which is conducive to the water droplets flowing into the liquid storage area 16. A gas storage area 22 is provided between the partition 17 and the inner wall of the condensate tank 10. A mounting port 23 is provided at one end of the condensate tank 10, and an air outlet 41 is provided at the other end. The air outlet 41, the mounting port 23 and the air inlet 25 are all strip-shaped, which is conducive to increasing the flow area of ​​steam and facilitating the entry and discharge of steam.

[0035] Steam enters from the air inlet 25, then enters the guide member 11, and then enters the condensation assembly 12 for condensation through the guide member 11 for guiding and accelerating dispersion, and the liquid with a lower temperature is input through the liquid inlet pipe 18, and then the liquid enters the multiple condensation plates 26, and the liquid after heat exchange by the steam is discharged from the liquid outlet pipe 19. When the steam encounters the colder condensation plate 26, it will form water droplets and adhere to the condensation plate 26, the liquid inlet pipe 18 and the liquid outlet pipe 19. In addition, the steam will pass through the partition 17 and enter the gas storage area 22, and then exchange heat again through the partition 17, and the steam after heat exchange will be discharged from the air outlet 41, and the condensate will be discharged from the liquid discharge pipe 27 in the liquid storage area 16.

[0036] One end of the guide member 11 is an air inlet 25, and the other end is an exhaust port 24. The air inlet 25 is placed in the mounting port 23. There are multiple guide plates 28 in the middle, and a steam channel 29 is formed between the guide plates 28 and the guide member 11. The exhaust port 24 faces the condensation assembly 12. An acceleration recess 30 and a guide protrusion 31 extending to the acceleration recess 30 are provided at the air inlet 25 and the steam channel 29.

[0037] The guide plate 28 is in an "S" shape, and the ends are interlocked to form a guide channel 32. The guide plate 28 includes a first protrusion 33 and a second protrusion 34, the first protrusion 33 faces the steam channel 29, and the second protrusion 34 faces the condensation assembly 12. The first protrusion 33 is provided with a blocking portion 35, and the second protrusion 34 is provided with a converging protrusion 36, so that the steam between the guide plates 28 and the guide plates 28 is converged through the converging protrusion 36 and enters the condensation area 14.

[0038] When steam enters from the air inlet 25, and then enters the acceleration recess 30 through the guide protrusion 31, the acceleration recess 30 can accelerate the steam, so that the steam passes through at an accelerated speed, and then enters the steam channel 29. A part of the steam discharged from the steam channel 29 enters the drainage channel 32, and the other part continues to move to the steam channel 29 and is blocked by the first protrusion 33, so that a part of the steam is blocked in the drainage channel 32. The steam discharged from the drainage channel 32 can be accelerated by the drainage channel 32. The spacing of the steam channel 29 is large, while the spacing of the drainage channel 32 is small, so that the steam pressure is increased by the drainage channel 32. When the steam is discharged from the drainage channel 32, due to the increase in the spacing of the exhaust port 24, the steam airflow from the drainage channel 32 with a larger pressure and a narrower pressure to the exhaust port 24, the pressure becomes smaller, and the steam with a larger pressure blows the steam with a smaller pressure, so that the steam is blown to the condensation component 12 for condensation.

[0039] The air flow pressure at the steam channel 29 is relatively low, and then is strengthened through the guide channel 32, and then becomes smaller when entering the exhaust port 24, so that the steam is blown out faster, which is conducive to accelerating the condensation of the steam.

[0040] The condensation assembly 12 is composed of a liquid inlet pipe 18, a liquid outlet pipe 19, a support 37 and a plurality of condensation plates 26. The support 37 is arranged on both sides of the condensation plate 26. The interior of the condensation plate 26 is hollowed out and one end is connected to the liquid inlet pipe 18, and the other end is connected to the liquid outlet pipe 19. A branch pipe 38 is arranged on the liquid inlet pipe 18 and the liquid outlet pipe 19. The branch pipe 38 is connected to the condensation plate 26 and also connected to the partition 17. The openings between the plurality of condensation plates 26 are larger at one end facing the flow guide 11, and smaller at the other end, and are arranged in an inclined manner. A plurality of first condensation holes 39 are arranged on the condensation plate 26. During installation, mounting protrusions 40 are arranged on both sides of the condensation plate 26, and mounting holes matching the mounting protrusions 40 are arranged on the support 37, so that the condensation plate 26 can be arranged in an inclined manner.

[0041] Furthermore, the difference in inclination angles between the condensation plates 26 is 5°. During installation, the distance between one side of each condensation plate 26 is larger, and the distance between the other end is smaller, so that the condensation plates 26 are all in an inclined setting.

[0042] A heat exchange method for a sectional energy-saving heat exchanger in a three-tower distillation system comprises the following steps:

[0043] S1, the steam of 1.0MPa and 205℃ passes through the first reboiler 4, and then is absorbed by the pressurizing tower 2, the temperature is reduced to 112℃, and is heated by the sectional heat exchanger 6 of the heating pre-tower 3;

[0044] S2, the steam condensate with a temperature of 75-80°C coming out of the sectional heat exchanger 6 of the heating pre-tower 3 enters the steam condensate recovery system 7;

[0045] S3, the steam condensate outlet of the first reboiler 4 enters the sectional heat exchanger 6, and then mixes with the steam condensate outlet of the second reboiler 5 and enters the steam condensate recovery system 7 for condensation and recovery.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A sectional energy-saving heat exchanger for a three-tower distillation system, characterized in that: include: A steam production system, a pressurizing tower, a pre-tower, a first reboiler, a second reboiler, a sectional heat exchanger and a steam condensate recovery system, wherein the steam production system is connected to the first reboiler and the second reboiler respectively, the first reboiler is simultaneously connected to the pressurizing tower, the steam condensate recovery system and the sectional heat exchanger, the sectional heat exchanger is located at the upper end of the second reboiler, the sectional heat exchanger and the second reboiler are connected to the steam condensate recovery system, the pre-tower is connected to the second reboiler and the sectional heat exchanger respectively, wherein the steam condensate recovery system is composed of a condensate tank, a guide member and a condensation assembly, the guide member and the condensation assembly are both installed in the condensate tank, one end of the guide member is an air inlet, the other end is an exhaust port, a plurality of guide plates are provided in the middle, a steam channel is formed between the guide plate and the guide member, and the exhaust port faces the condensation assembly; The condensation assembly is composed of a liquid inlet pipe, a liquid outlet pipe, a support and a plurality of condensation plates, wherein the support is arranged on both sides of the condensation plate, the interior of the condensation plate is hollowed out and one end is connected to the liquid inlet pipe, and the other end is connected to the liquid outlet pipe, and the openings between the plurality of condensation plates are larger at one end facing the flow guide and smaller at the other end, and are arranged in an inclined manner; The guide plate is "S"-shaped and is interlocked end to end to form a guide channel. The guide plate includes a first protrusion and a second protrusion. The first protrusion faces the steam channel and the second protrusion faces the condensation assembly. The first protrusion is provided with a blocking portion and the second protrusion is provided with a converging protrusion.

2. The sectional energy-saving heat exchanger for a three-tower distillation system according to claim 1, characterized in that: An acceleration recess and a guide protrusion extending toward the acceleration recess are arranged at the air inlet and the steam channel.

3. The sectional energy-saving heat exchanger for a three-tower distillation system according to claim 1, characterized in that: The condensation plate is provided with a plurality of first condensation holes.

4. The sectional energy-saving heat exchanger for a three-tower distillation system according to claim 1, characterized in that: The difference in inclination angles between the condensation plates is 5°.

5. The sectional energy-saving heat exchanger for a three-tower distillation system according to claim 1, characterized in that: The condensate tank is also provided with a partition, which is located at the rear end of the condensation assembly. The middle of the partition is hollowed out, and the lower end is connected to the liquid inlet pipe, and the upper end is connected to the liquid outlet pipe.

6. The sectional energy-saving heat exchanger for a three-tower distillation system according to claim 5, characterized in that: The partition is provided with a plurality of second condensation holes, and the second condensation holes are arranged to be inclined downward.

7. A heat exchange method for a sectional energy-saving heat exchanger for a three-tower distillation system as claimed in claim 1, characterized in that: The following steps are involved: S1, 1.0MPa 205℃ steam passes through the first reboiler, then is absorbed by the pressure tower, the temperature drops to 112℃, and is heated by the sectional heat exchanger of the heating pre-tower; S2, the steam condensate with a temperature of 75-80°C coming out of the sectional heat exchanger of the heating pre-tower enters the steam condensate recovery system; S3: The steam condensate outlet of the first reboiler enters the sectional heat exchanger, and then mixes with the steam condensate outlet of the second reboiler and enters the steam condensate recovery system for condensation and recovery.

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