A BDO distillation and dehydration system
Patent Information
- Application Number
- CN202522089003.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-28
- Publication Date
- 2026-09-11
- Estimated Expiration
- 2035-09-28
AI Technical Summary
[0003]本实用新型的目的在于克服现有技术中存在蒸汽浪费现象的不足，提供一种BDO精馏脱水系统
Smart Images
Figure CN224735780U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of dehydration device technology, specifically to a BDO distillation dehydration system. Background Technology
[0002] The original design of the dehydration system in the 903 distillation unit of the BDO plant was as follows: Crude butanediol, containing approximately 65% water after high-pressure hydrogenation, was passed through vacuum column C301 and atmospheric column C302 to separate water and some low-boiling alcohols from butanediol. The product was then flash-distilled in C303 and sent to subsequent processing stages. The discharge temperature of C301 was approximately 70°C, and the operating temperature of C302 required to be 137-140°C. Therefore, the material from C301 to C302 needed to be preheated in the reboiler E304 with 0.8 MPa medium-pressure steam, resulting in high steam consumption. Furthermore, the BDO plant had surplus 0.13 MPa steam produced byproducts that were vented, leading to steam waste. Utility Model Content
[0003] The purpose of this invention is to overcome the shortcomings of existing technologies that involve steam waste and to provide a BDO distillation and dehydration system.
[0004] To achieve the above objectives, the present invention adopts the following technical solution: a BDO distillation and dehydration system, comprising a vacuum tower installed on a production line for receiving crude BDO products, a primary heat exchanger installed downstream of the vacuum tower, the primary heat exchanger being connected to a 0.13 MPa steam pipe for venting, a secondary heat exchanger installed at the output end of the primary heat exchanger, and an atmospheric pressure tower for dehydration installed at the output end of the secondary heat exchanger.
[0005] Furthermore, the air inlet pipe of the 0.13Mpa steam pipe is DN150 and 80 meters long, and the condensate pipe of the 0.13Mpa steam pipe is DN50 and 100 meters long.
[0006] Furthermore, the heating tube of the secondary heat exchanger is a 0.8 MPa steam pipe, and the secondary heat exchanger is equipped with a condensate pipe.
[0007] Furthermore, the inlet of the 0.13 MPa steam pipe is connected to the steam vent pipe of the BDO unit.
[0008] Furthermore, a transfer pump is installed between the vacuum tower and the primary heat exchanger.
[0009] The beneficial effects of this utility model embodiment are as follows: A new heat exchanger E312 (as a primary heat exchanger) is added between the vacuum tower C301 and the original reboiler E304, and connected in series with the original reboiler E304 (as a secondary heat exchanger) to form a two-stage heating system. This tiered energy utilization method solves the problem of excess low-pressure steam venting and significantly reduces the consumption of medium-pressure steam. Actual operation data shows that after the modification, the feed temperature of the atmospheric tower C302 has been stably increased from the original 72℃ to 105℃, which is closer to the target operating temperature. This effectively reduces the load on the secondary heating reboiler E304, achieving the recovery and utilization of low-pressure steam and the saving of medium-pressure steam. While ensuring stable production operation, it significantly reduces the energy consumption and production costs of the BDO distillation and dehydration process, demonstrating significant economic benefits and environmental value. Attached Figure Description
[0010] Figure 1 This is a schematic diagram of the overall structure of this utility model; In the diagram: 1. Vacuum tower; 2. Primary heat exchanger; 3. Secondary heat exchanger; 4. Atmospheric tower. Detailed Implementation
[0011] The preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely for explaining the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.
[0012] See Figure 1 This utility model discloses a BDO distillation and dehydration system. The original BDO unit 903 distillation dehydration system operates as follows: the crude butanediol product (containing approximately 65% water) after high-pressure hydrogenation first enters vacuum column 1 for preliminary separation, at which point the bottom outlet temperature is approximately 70°C. Since the subsequent atmospheric column 4 requires an operating temperature of 137-140°C to achieve effective separation of water and butanediol, the original design required heating the outlet from vacuum column 1 via a reboiler E304, using 0.8MPa medium-pressure steam as the heating medium. This process presents two energy utilization problems: firstly, the consumption of 0.8MPa steam is relatively large, resulting in high operating costs; secondly, the surplus 0.13MPa low-pressure steam produced by the unit is vented due to ineffective utilization, leading to energy waste.
[0013] This technical solution mainly involves modifying the original system, with the core improvement being the upgrading of the original single-stage heating process to a two-stage heating process. The specific implementation is as follows: A new heat exchanger, E312 (serving as primary heat exchanger 2), is added between vacuum tower 1 and the original reboiler E304, and connected in series with the original reboiler E304 (serving as secondary heat exchanger 3) to form a two-stage heating system. The bottom product of vacuum tower 1, after being pressurized by transfer pump P301, first enters the tube side of heat exchanger E312. Simultaneously, 0.13MPa low-pressure steam is drawn from the vent line of the BDO unit's by-product steam and transported to the shell side of heat exchanger E312 through a DN150 steam pipeline (80 meters long), serving as the primary heating source. After heat exchange between the steam and the material in the shell and tube sides, the condensate is returned to the low-pressure steam condensate system through a DN50 condensate pipeline (100 meters long), realizing the recovery and utilization of steam thermal energy.
[0014] After primary preheating in heat exchanger E312, the material temperature is raised from 70℃ to approximately 105℃, and then enters the tube side of the original reboiler E304. At this time, reboiler E304 still uses 0.8MPa medium-pressure steam as the secondary heating source (the steam pipeline and condensate pipeline are consistent with the original design), further heating the material to the required operating temperature of 137-140℃ for atmospheric distillation column 4, and finally sending it to atmospheric distillation column 4 for dehydration and rectification.
[0015] By adding heat exchanger E312, the previously vented 0.13MPa low-pressure steam was introduced into the system as a primary preheating heat source, replacing part of the heating load originally borne by the 0.8MPa medium-pressure steam. This cascaded energy utilization method not only solved the problem of excess low-pressure steam venting but also significantly reduced the consumption of medium-pressure steam. Actual operation data shows that after the modification, the feed temperature of atmospheric tower 4 steadily increased from 72℃ to 105℃, closer to the target operating temperature, effectively reducing the load on the secondary reboiler E304. At the same time, the consumption of 0.8MPa medium-pressure steam decreased by approximately 2 tons / hour, and the opening of the 0.13MPa steam vent valve decreased from 70% before the modification to 40%, significantly improving steam waste. In addition, the water content in the material after two-stage heating was stably controlled below 3%, fully meeting the requirements of subsequent processes for raw material quality.
[0016] In summary, this technical solution, through program optimization and equipment addition, achieves the recovery and utilization of low-pressure steam and the saving of medium-pressure steam. While ensuring stable production operation, it significantly reduces energy consumption and production costs in the BDO distillation and dehydration process, demonstrating significant economic benefits and environmental value.
[0017] It should be noted that in the description of this utility model, terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," which indicate direction or positional relationships, are based on the direction or positional relationships shown in the accompanying drawings. These are used merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0018] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0019] The term "comprising" or any other similar term is intended to cover non-exclusive inclusion, such that a process, article, or apparatus / device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to those processes, articles, or apparatus / devices.
[0020] The technical solution of this utility model has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the protection scope of this utility model is obviously not limited to these specific embodiments. Without departing from the principle of this utility model, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of this utility model.
Claims
1. A BDO distillation and dehydration system, characterized in that: The system includes a vacuum tower installed on the production line to receive crude BDO products, a primary heat exchanger downstream of the vacuum tower, a 0.13 MPa steam pipe connected to the primary heat exchanger for venting, a secondary heat exchanger at the output end of the primary heat exchanger, and an atmospheric pressure tower for dehydration at the output end of the secondary heat exchanger.
2. The BDO distillation and dehydration system according to claim 1, characterized in that: The 0.13 MPa steam pipeline has an air inlet pipe of DN150 and a length of 80 meters, and a condensate pipe of DN50 and a length of 100 meters.
3. The BDO distillation and dehydration system according to claim 1, characterized in that: The heating tube of the secondary heat exchanger is a 0.8 MPa steam pipe, and the secondary heat exchanger is also equipped with a condensate pipe.
4. The BDO distillation and dehydration system according to claim 1, characterized in that: The inlet of the 0.13 MPa steam pipe is connected to the steam vent pipe of the BDO unit.
5. The BDO distillation and dehydration system according to claim 1, characterized in that: A transfer pump is installed between the vacuum tower and the first-stage heat exchanger.