A distillation device and a low-loss amine purification energy-saving and consumption-reducing system with the same

Abstract

The utility model relates to amine purification equipment technical field, and disclose a distillation device and have its low loss amine purification energy -conserving and consumption -reducing system, including tower body, the inside of tower body is provided with multiple tower plate from top to bottom, form mass transfer heat transfer space between two adjacent tower plate, and the tower plate includes the liquid receiving tray and valve body, and a plurality of through -holes are seted up on the liquid receiving tray, and the valve body is installed in the through -hole, and the gas outlet of valve body is the floating structure. The utility model cap is limited with the snap claw of the top end of the pipe seat through the cylinder, can open the height of automatic regulation with the change of gas phase load. Under low gas speed, the cap falls close to close, effectively reduces the liquid leakage, guarantees the separation efficiency, under high gas speed, the cap fully opens, and provides multiple grooves as the airflow channel, significantly reduces the gas pressure of tower plate downside.

Description

Technical Field

[0001] This utility model relates to the field of amine purification equipment technology, specifically a distillation device and a low-loss amine purification energy-saving and consumption-reducing system having the same. Background Technology

[0002] In the context of addressing global climate change, carbon capture technology has become an important means of reducing carbon dioxide emissions. Amine-based absorption is widely used in the carbon capture field due to its excellent carbon dioxide absorption performance. However, in amine-based carbon capture systems, the amine solution needs to be regenerated after absorbing carbon dioxide for recycling, and existing amine regeneration equipment has many problems.

[0003] From an energy consumption perspective, traditional amine regeneration processes heavily rely on reboilers, requiring significant amounts of steam or electricity to heat the amine solution and promote absorbent evaporation for purification. In terms of equipment investment, traditional equipment is often structurally fragmented, with each functional module operating independently. This not only results in a large footprint but also complex piping connections, increasing manufacturing, installation, and commissioning costs. Furthermore, operating costs remain high due to insufficient amine solution purification; the accumulation of impurities in the amine solution reduces its absorption capacity, thus increasing the need for amine solution replenishment and equipment maintenance costs. Existing ion exchange and electrodialysis technologies generate large volumes of wastewater and suffer high amine solution losses, increasing the cost of carbon dioxide capture. Simultaneously, a large amount of wastewater requires further treatment, leading to poor environmental and economic efficiency.

[0004] Therefore, developing an amine regeneration device that can effectively solve the above problems is of great significance for promoting the widespread application of carbon capture technology and reducing enterprise operating costs. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution: This utility model is a distillation apparatus, including a column body. The interior of the column body is provided with multiple trays from top to bottom, and a mass and heat transfer space is formed between two adjacent trays. Each tray includes a liquid receiving plate and a valve body. The liquid receiving plate has multiple through holes, and the valve body is installed in the through holes. The gas outlet of the valve body is a floating structure.

[0006] Furthermore, an overflow weir is provided on one side of the receiving tray, and an extension plate is connected below the overflow weir. The extension plate and the inner wall of the tower body form a liquid discharge channel.

[0007] Furthermore, the lower side of the extension plate is lower than the upper side of the overflow weir below.

[0008] Furthermore, the valve body includes a pipe seat and a valve cap installed in the through hole. The top of the pipe seat is provided with an inwardly retracted claw, and the valve cap is provided with a column inside. The valve cap is installed on the top of the pipe seat through a convex ring at the end of the column and a limiting engagement with the claw.

[0009] Furthermore, multiple grooves are formed at the edge of the valve cap; The upper side of the trough is lower than the height of the upper side of the corresponding overflow weir.

[0010] Furthermore, the bottom end of the tube seat extends out of the through hole and is fitted with the top block for installation.

[0011] Furthermore, the limiting member has two T-shaped grooves, in which a top block and a spring are installed. The limiting member is sleeved on the bottom end of the tube seat, and the end of the top block fits into the limiting groove on the tube seat.

[0012] A low-loss amine purification energy-saving and consumption-reducing system with a distillation unit comprises an absorption tower, a distillation tower, a lean liquor cooler, and a lean liquor pump; The cold lean solution enters the absorption tower through the lean solution pump. After absorbing carbon, it becomes a rich solution and flows into the distillation tower. The rich solution desorbs through the distillation tower and becomes a hot lean solution. It then flows through the lean solution cooler and becomes a cold lean solution, starting a new absorption cycle.

[0013] This utility model has the following beneficial effects: This utility model's valve cap, through a locking mechanism between the column and the top of the tube seat, can automatically adjust its opening height according to changes in gas phase load. At low gas velocities, the valve cap descends to near-close, effectively reducing leakage and ensuring separation efficiency; at high gas velocities, the valve cap fully opens and provides multiple channels as airflow passages, significantly reducing the gas pressure on the lower side of the tray.

[0014] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments 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 these drawings without creative effort.

[0016] Figure 1 This is a cross-sectional schematic diagram of the distillation apparatus of this utility model; Figure 2 This is a schematic diagram of the tower plate of this utility model. Figure 1 ; Figure 3 This is a schematic diagram of the tower plate of this utility model. Figure 2 ; Figure 4 This is a partial schematic diagram of the tower plate of this utility model; Figure 5 for Figure 4 A cross-sectional diagram; Figure 6 for Figure 5 Enlarged view of point A; Figure 7 This is an exploded view of the valve body; Figure 8 for Figure 7 A cross-sectional diagram; Figure 9 Diagram of a low-loss amine purification, energy-saving, and consumption-reducing system; The attached diagram lists the components represented by each number as follows: In the diagram: 1. Tower body; 101. Gas inlet; 102. Liquid outlet; 103. Liquid inlet; 104. Gas outlet; 2. Receiving tray; 201. Overflow weir; 202. Through hole; 3. Valve body; 301. Pipe seat; 302. Valve cap; 303. Limiting element; 304. Column; 305. Tank; 306. Claw; 307. Limiting groove; 308. Top block; 309. Spring; 4. Extension plate. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. 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 protection scope of the present utility model.

[0018] like Figure 9 As shown, the low-loss amine purification energy-saving and consumption-reducing system with a distillation unit consists of an absorption tower, a distillation / desorption tower, a lean liquor cooler, and a lean liquor pump. The cold lean solution enters the absorption tower through the lean solution pump. After absorbing carbon, it becomes a rich solution and flows into the distillation tower. The rich solution desorbs through the distillation tower and becomes a hot lean solution. It then flows through the lean solution cooler and becomes a cold lean solution, starting a new absorption cycle.

[0019] The distillation column is the core equipment, while the cold lean solution and the hot lean solution are two different states of the same material (lean absorbent) when it enters the top of the column and leaves the bottom of the column. They constitute a complete absorption-desorption cycle, the purpose of which is to separate the key components in the mixture.

[0020] The cold lean solution enters from the top of the absorption tower, absorbs the target components in the rising gas flow, and then becomes a rich solution that flows out from the bottom of the tower.

[0021] The rich solution is pumped into the upper middle part of the distillation / desorption column.

[0022] Inside the distillation / desorption column, the rich liquid flows downward, and the reboiler at the bottom of the column provides heat to vaporize the light components in the liquid. The vapor flows upward and comes into countercurrent contact with the falling liquid, decomposing and extracting the absorbent components in the liquid step by step. The desorbed gas is discharged from the top of the column.

[0023] At the bottom of the column, the pure but high-temperature absorbent, which no longer contains the absorbed components, is discharged; this is called hot lean solution.

[0024] The hot lean solution enters the lean solution cooler, where it exchanges heat with the cooling medium, such as water or air, and its temperature decreases, turning it into a cold lean solution.

[0025] After being pressurized by a pump, the cold lean solution is sent back to the top of the absorption tower to start a new absorption cycle.

[0026] The lean liquor solution can be designed with either electric or steam heating modes, utilizing a high-efficiency amine solution. The electric heating section employs high-efficiency heating elements and is equipped with an intelligent temperature control system that can precisely adjust the heating power in real time based on changes in the amine solution's temperature, achieving rapid and accurate heating. The steam heating section is connected to an external steam source via a high-efficiency heat exchanger. The steam exchanges heat with the amine solution within the heat exchanger, heating the solution to the required regeneration temperature, thus achieving regeneration. This dual-heating mode can be flexibly selected based on on-site energy supply and cost-effectiveness, effectively reducing energy consumption.

[0027] The amine heating and regeneration system employs double-effect vacuum distillation technology to reduce energy consumption and improve evaporation efficiency. The first-effect distillation temperature is controlled at approximately 80℃ and the pressure at approximately -90 kPa; the second-effect distillation temperature is controlled at approximately 120℃ and the pressure at approximately -90 kPa. The purified amine solution and water produced during distillation are cooled and returned to the carbon capture system or electrodialysis system for recycling, reducing wastewater generation and discharge.

[0028] Please see Figures 1-8 As shown, this utility model is a distillation apparatus, including a column body 1. The interior of the column body 1 is provided with multiple trays from top to bottom. A mass transfer and heat transfer space is formed between two adjacent trays. The core of the tray includes a liquid receiving plate 2 and multiple valve bodies 3. Multiple through holes 202 are opened on the liquid receiving plate 2. The valve bodies 3 are installed in the through holes 202. The gas outlet of the valve body 3 is a floating structure.

[0029] An overflow weir 201 is provided on one side of the receiving tray 2. The overflow weir 201 is formed by bending upward through one side edge of the receiving tray 2 to maintain a certain liquid level on the tray. An extension plate 4 is connected below the overflow weir 201. The extension plate 4 and the inner wall of the tower body 1 form a downcomer channel. After the liquid from this tray passes the overflow weir 201, it will flow to the lower tray along this downcomer channel.

[0030] The lower side of the extension plate 4 is lower than the upper side of the overflow weir 201 below, which ensures that after the liquid flows out from the downcomer channel, it can be effectively received by the overflow weir 201 of the next tray and guided to its receiving tray 2. This avoids the liquid dripping directly onto the mass transfer area of ​​the tray, causing leakage and short circuit, and ensures the uniform distribution and stable flow of the liquid.

[0031] The rising steam from the lower tray passes through the through-hole 202 on the liquid receiving tray 2, opening the float valve body 3. The steam disperses in the form of bubbles through the gaps around the valve plate and enters the liquid layer held on the tray for mass and heat transfer. The valve opening is automatically adjusted according to the steam load, maintaining good sealing performance even at low gas velocities and reducing leakage.

[0032] Meanwhile, the liquid in the upper tray flows down through the downcomer channel formed by the extension plate 4 and the tower wall. Since the lower edge of the extension plate 4 is lower than the upper edge of the lower overflow weir 201, the liquid is smoothly guided to the receiving area of ​​the lower tray, crosses the overflow weir 201 of the tray, and forms a uniform liquid layer on it, waiting to come into contact with the next rising steam.

[0033] The valve body 3 includes a pipe seat 301 and a valve cap 302 installed in the through hole 202. The top of the pipe seat 301 is provided with an inwardly retracted claw 306. The valve cap 302 is provided with a column 304 inside. The valve cap 302 is installed on the top of the pipe seat 301 through the limited engagement of the protruding ring at the end of the column 304 and the claw 306.

[0034] Multiple grooves 305 are provided at the edge of the valve cap 302, and the upper side of the groove 305 is lower than the upper side of the corresponding overflow weir 201.

[0035] The bottom end of the tube seat 301 extends out of the through hole 202 and is installed in conjunction with the top block 308.

[0036] The limiting member 303 has two T-slots, in which a top block 308 and a spring piece 309 are installed. The limiting member 303 is sleeved on the bottom end of the tube seat 301, while the end of the top block 308 is fitted into the limiting groove 307 on the tube seat 301.

[0037] Rising steam from the lower tray enters the bottom of the tube holder 301, pushing the valve cap 302 upward. The steam then exits horizontally in the form of fine bubbles through multiple slots 305 on the edge of the valve cap 302, making full contact with the liquid on the tray, resulting in high mass transfer efficiency.

[0038] As the gas phase load changes, the opening height of the valve cap 302 automatically adjusts. At low gas velocities, it closes tightly to reduce leakage, while at high gas velocities, it provides a larger channel area to reduce pressure drop, offering excellent operational flexibility.

[0039] The present invention achieves a detachable yet anti-fall-off connection of the valve cap by limiting the engagement between the claw 306 and the protruding ring of the column 304, which is easy to assemble and maintain.

[0040] The unique design of the upper edge of the tank 305 being lower than the overflow weir 201 provides the device with built-in flood prevention safety features, resulting in more stable operation.

[0041] The valve body can be quickly and reliably installed and locked from the bottom by the cooperation of the limiting component 303, the spring-loaded top block 308 and the limiting groove 307. The structure is compact and has a strong load-bearing capacity.

[0042] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A distillation apparatus, comprising a column body (1), characterized in that: The tower body (1) has multiple tower plates arranged from top to bottom inside, and a mass transfer and heat transfer space is formed between two adjacent tower plates; The tray includes a liquid receiving tray (2) and a valve body (3); The liquid receiving plate (2) has multiple through holes (202), and a valve body (3) is installed in the through hole (202). The air outlet of the valve body (3) is a floating structure.

2. The distillation apparatus according to claim 1, characterized in that: An overflow weir (201) is provided on one side of the receiving pan (2). An extension plate (4) is connected below the overflow weir (201), and the extension plate (4) forms a liquid discharge channel with the inner wall of the tower body (1).

3. A distillation apparatus according to claim 2, characterized in that: The lower side of the extension plate (4) is lower than the upper side of the overflow weir (201) below.

4. A distillation apparatus according to claim 1, characterized in that: The valve body (3) includes a pipe seat (301) installed in the through hole (202) and a valve cap (302); The top of the tube seat (301) is provided with an inwardly retracted claw (306). The valve cap (302) has a column (304) inside. The valve cap (302) is installed on the top of the pipe seat (301) through the convex ring at the end of the column (304) and the claw (306) for limiting and cooperating.

5. A distillation apparatus according to claim 4, characterized in that: The valve cap (302) has multiple grooves (305) at its edge; The upper side of the trough (305) is lower than the height of the upper side of the corresponding overflow weir (201).

6. A distillation apparatus according to claim 4, characterized in that: The bottom end of the tube seat (301) extends out of the through hole (202) and is installed in conjunction with the top block (308).

7. A distillation apparatus according to claim 6, characterized in that: The limiting member (303) has two T-slots, and a top block (308) and a spring piece (309) are installed in the T-slots. The limiting member (303) is sleeved on the bottom end of the tube seat (301), while the end of the top block (308) is fitted into the limiting groove (307) opened on the tube seat (301).

8. A low-loss amine purification, energy-saving, and consumption-reducing system with a distillation apparatus according to any one of claims 1-7, characterized in that: The components include an absorption tower, a distillation tower, a lean liquor cooler, and a lean liquor pump; The cold lean solution enters the absorption tower through the lean solution pump. After absorbing carbon, it becomes a rich solution and flows into the distillation tower. The rich solution desorbs through the distillation tower and becomes a hot lean solution. It then flows through the lean solution cooler and becomes a cold lean solution, starting a new absorption cycle.

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