Novel CO2 refining device convenient to adjust
By designing a flexible and adjustable CO2 purification device, the problems of high CO content and composition fluctuations in the raw gas were solved, enabling the efficient acquisition of high-purity CO2 products under different operating conditions and avoiding the need for additional equipment.
Patent Information
- Application Number
- CN202423267719.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-30
- Publication Date
- 2026-01-06
- Estimated Expiration
- 2034-12-30
AI Technical Summary
Existing CO2 refining units can only sacrifice CO2 yield to obtain high-purity products when the CO content in the feed gas is high. Furthermore, fluctuations in the upstream feed gas mean that a single CO2 distillation column cannot obtain high-purity CO2 and cannot adapt to compositional fluctuations.
A device comprising a distillation column, a reboiler, a condenser, and a reflux tank was designed. By incorporating baffles, switching valves, and sensors, the feed composition can be flexibly adjusted, allowing for the production of high-purity CO2 products under different operating conditions.
When the composition of the feed gas fluctuates, especially when it contains light and heavy impurities, CO2 products with a purity of 99.9% mol can be obtained by adjusting the operation inside the tower, avoiding the need to add new equipment and maintaining efficient operation.
Smart Images
Figure CN223760734U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of chemical mass transfer and separation technology, and in particular to a novel CO2 purification device that is easy to adjust. Background Technology
[0002] To achieve low-carbon economic development and promote a comprehensive green transformation of economic and social development, my country has made comprehensive arrangements for key tasks in controlling greenhouse gas emissions, increased investment in low-carbon industries such as energy conservation, emission reduction, and green environmental protection, and is making orderly progress in various tasks to achieve "carbon peaking" and "carbon neutrality".
[0003] Low-temperature methanol washing technology is mature and has a proven track record in industrial applications. It is widely used in gas purification systems for synthetic ammonia, synthetic methanol and other carbonyl synthesis, city gas, industrial hydrogen production, and natural gas desulfurization both domestically and internationally. In coal-based chemical production, crude syngas contains a large amount of excess CO2 and small amounts of acidic gases such as H2S and COS. These acidic gases are detrimental to production, and the sulfides they contain can cause catalyst poisoning in downstream processes. Therefore, they must be removed and recovered. Thus, the core technology of low-temperature methanol washing is the removal of acidic gases. During the desulfurization process, a large amount of excess CO2 is also washed away.
[0004] Currently, with the development of low-temperature methanol washing technology and the requirements for carbon emissions, low-temperature methanol washing units can produce CO2 product gas as a byproduct. However, this product gas contains trace amounts of H2, N2, and CO, and cannot be directly utilized. Therefore, CO2 refining units have emerged.
[0005] Existing CO2 purification devices only consider the presence of trace amounts of H2, N2, and CO. In actual operation, when the CO content in the feed gas is high, the CO2 yield must be sacrificed to obtain a high-purity CO2 product. Furthermore, fluctuations in the upstream feed gas, carrying small amounts of CH3OH into the system, prevent a single CO2 distillation column from achieving a high-purity CO2 content. To address the problems of current CO2 purification devices, this invention proposes a novel, easily adjustable CO2 purification device. Utility Model Content
[0006] The main objective of this invention is to propose a novel, easily adjustable CO2 purification device to address the shortcomings of existing CO2 purification devices that only consider trace amounts of H2, N2, and CO. In actual operation, when the CO content in the feed gas is high, the CO2 yield must be sacrificed to obtain a high-purity CO2 product. Furthermore, fluctuations in the upstream feed gas, carrying small amounts of CH3OH into the system, prevent a single CO2 distillation column from achieving a high-purity CO2 content.
[0007] To achieve the above objectives, the present invention adopts the following technical solution:
[0008] This utility model provides a novel, easily adjustable CO2 purification device, including a distillation column. A feed inlet pipe is located in the middle of one side of the distillation column, and a side outlet pipe opposite to the feed inlet pipe is located on the other side of the distillation column. A vertically arranged baffle is located between the feed inlet pipe and the side outlet pipe. A bottom outlet pipe is located at the bottom of the distillation column. The device also includes a reboiler, whose feed end is connected to the bottom of the distillation column via a reboiler-to-reboiler pipe, and whose outlet end is connected to the upper bottom of the distillation column via a return pipe.
[0009] The distillation column is provided with a vapor discharge pipeline at the top, and also includes a condenser and a reflux tank. The vapor discharge pipeline is connected to the feed end of the condenser via a first connecting pipe. The discharge end of the condenser is connected to the feed end of the reflux tank via a second connecting pipe. The discharge end of the reflux tank is connected to the top of the distillation column via a third connecting pipe. The reflux tank is provided with a vapor discharge pipe inside.
[0010] As a preferred embodiment of this utility model, a first switching valve is provided on the gas phase discharge pipeline.
[0011] As a preferred embodiment of this utility model, the first connecting pipe is provided with a second switching valve, and the third connecting pipe is provided with a third switching valve.
[0012] As a preferred embodiment of this utility model, a fourth switching valve is provided on the side discharge pipeline.
[0013] As a preferred embodiment of this utility model, the horizontal height of the bottommost end of the partition is higher than the horizontal height of the connection between the reboiler pipeline and the distillation column; the horizontal height of the topmost end of the partition is lower than the horizontal height of the connection between the third connecting pipe and the top of the distillation column.
[0014] As a preferred technical solution of this utility model, the raw material inlet pipe (2) is equipped with a CO sensor and a methanol sensor.
[0015] The beneficial effects of this utility model are:
[0016] 1. In this novel, easily adjustable CO2 refining device, when the feed contains trace amounts of CO and no methanol, the light component impurities at the top of the column are directly collected, and the CO2 product is obtained from the bottom of the column. When the feed contains trace amounts of CO but also contains trace amounts of methanol, the light component impurities at the top of the column are directly collected, the CO2 product is collected from the side stream, and the heavy component impurity methanol is collected from the bottom of the column. When the feed contains trace amounts of CO and trace amounts of methanol, the vapor phase at the top of the column enters the top condenser. After condensation, the light component impurities are collected from the condenser, the condensate is refluxed, the CO2 product is collected from the side stream, and the heavy component impurity methanol is collected from the bottom of the column. Furthermore, this invention only requires a single column, and by adjusting the internal structure, high-purity CO2 products can be obtained under different operating conditions.
[0017] 2. This novel, easily adjustable CO2 purification device can solve the problem of obtaining a CO2 product with a purity of 99.9% mol by adjusting the operation of the tower without adding new equipment when the composition of the raw gas fluctuates, especially when the raw gas contains both light and heavy component impurities. Attached Figure Description
[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.
[0019] Figure 1 This is a schematic diagram of the structure of a novel, easily adjustable CO2 purification device according to Embodiment 1 of this utility model.
[0020] In the diagram: 1. Distillation column; 2. Feed inlet; 3. Side outlet; 4. Baffle; 5. Boiler outlet; 6. Reboiler; 7. Reboiler return line; 8. Return line; 9. Vapor outlet; 10. Condenser; 11. Reflux tank; 12. First connecting pipe; 13. Second connecting pipe; 14. Third connecting pipe; 15. Vapor outlet; 16. First switching valve; 17. Second switching valve; 18. Third switching valve; 19. Fourth switching valve.
[0021] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation
[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.
[0023] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," such descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features.
[0024] Example 1
[0025] like Figure 1 As shown, this utility model discloses a novel, easily adjustable CO2 purification device, comprising a distillation column 1, a raw material inlet pipe 2 located in the middle of one side of the distillation column 1, and a side discharge pipe 3 located on the other side of the distillation column 1 opposite to the raw material inlet pipe 2. A vertically arranged baffle 4 is provided between the raw material inlet pipe 2 and the side discharge pipe 3. A bottom discharge pipe 5 is provided at the bottom of the distillation column 1. It also includes a reboiler 6, the feed end of which is connected to the bottom of the distillation column 1 via a reboiler-to-reboiler pipe 7, and the discharge end of which is connected to the upper side of the bottom of the distillation column 1 via a return pipe 8.
[0026] The distillation column 1 is equipped with a vapor discharge line 9 at the top, and also includes a condenser 10 and a reflux tank 11. The vapor discharge line 9 is connected to the feed end of the condenser 10 via a first connecting pipe 12. The discharge end of the condenser 10 is connected to the feed end of the reflux tank 11 via a second connecting pipe 13. The discharge end of the reflux tank 11 is connected to the top of the distillation column 1 via a third connecting pipe 14. The reflux tank 11 is equipped with a vapor discharge line 15. When the feed contains trace amounts of CO and no methanol, the light component impurities at the top of the column are directly collected, and CO2 product is obtained from the bottom of the column. When the feed contains trace amounts of CO but also contains trace amounts of methanol, the light component impurities at the top of the column are directly collected, the CO2 product is collected from the side stream, and the heavy component impurities methanol are collected from the bottom of the column. When the feed contains trace amounts of CO and methanol, the gas phase at the top of the column enters the top condenser. After condensation, the light component impurities are collected from the condenser, the condensate is refluxed, the CO2 product is collected from the side stream, and the heavy component impurity methanol is collected from the bottom of the column. Moreover, this utility model only sets up a single column. By adjusting the internal results, high-purity CO2 products can be obtained under different operating conditions.
[0027] It can solve the problem of obtaining CO2 product with a purity of 99.9% mol by adjusting the operation of the tower without adding new equipment when the composition of the raw gas fluctuates, especially when the raw gas contains both light and heavy impurities.
[0028] A first switching valve 16 is provided on the gas phase discharge pipeline 9. A second switching valve 17 is provided on the first connecting pipe 12, and a third switching valve 18 is provided on the third connecting pipe 14. A fourth switching valve 19 is provided on the side discharge pipeline 3. This facilitates the shut-off control of each pipeline.
[0029] The bottom of the baffle 4 is at a height higher than the connection point between the reboiler line 7 and the distillation column 1; the top of the baffle 4 is at a height lower than the connection point between the third connecting pipe 14 and the top of the distillation column 1. The feed inlet pipe 2 is equipped with a CO sensor and a methanol sensor, which facilitates the control of the opening and closing of each pipeline based on the composition of the feed gas. When the feed gas contains both light and heavy impurities, a CO2 product with a purity of 99.9% mol can still be obtained by adjusting the operation of the column without adding new equipment.
[0030] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.
[0031] Furthermore, the use of "and / or" or "and / or" throughout the text implies three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies both A and B. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.
Claims
1. A novel and easily adjustable CO2 refining unit comprising a rectification column (1), characterized by: The rectification tower (1) is provided with a raw material inlet pipe (2) in the middle of one side, the other side of the rectification tower (1) is provided with a side line discharge pipeline (3) opposite to the raw material inlet pipe (2), the rectification tower (1) is provided with a vertically arranged partition plate (4) between the raw material inlet pipe (2) and the side line discharge pipeline (3); the bottom of the rectification tower (1) is provided with a tower kettle discharge pipeline (5); further comprising a reboiler (6), the feed end of the reboiler (6) is communicated with the bottom of the rectification tower (1) through a reboiler pipeline (7), the discharge end of the reboiler (6) is connected with the upper side of the bottom of the rectification tower (1) through a return pipeline (8); The top of the rectification tower (1) is provided with a gas phase discharge pipeline (9), further comprising a condenser (10) and a reflux tank (11), the gas phase discharge pipeline (9) is connected with the feed end of the condenser (10) through a first connecting pipe (12), the discharge end of the condenser (10) is connected with the feed end of the reflux tank (11) through a second connecting pipe (13), the discharge end of the reflux tank (11) is connected with the top of the rectification tower (1) through a third connecting pipe (14), and the reflux tank (11) is internally provided with a gas phase outlet pipe (15).
2. A novel CO2 refining device for easy adjustment according to claim 1, characterized in that, The gas phase discharge pipeline (9) is provided with a first on-off valve (16).
3. A novel CO2 refining device for easy adjustment according to claim 1, characterized in that, The first connecting pipe (12) is provided with a second on-off valve (17), and the third connecting pipe (14) is provided with a third on-off valve (18).
4. A novel CO2 refining device for easy adjustment according to claim 1, characterized in that, The side line discharge pipeline (3) is provided with a fourth on-off valve (19).
5. A novel CO2 refining device for easy adjustment according to claim 1, characterized in that, The lowest end of the partition plate (4) is higher than the connection between the reboiler pipeline (7) and the rectification tower (1), and the highest end of the partition plate (4) is lower than the connection between the third connecting pipe (14) and the top of the rectification tower (1).
6. A novel CO2 refining device for easy adjustment according to claim 1, characterized in that, The raw material inlet pipe (2) is provided with a CO sensor and a methanol sensor.