A vapor-liquid separator for a barrier heat pump rectifier

Abstract

The utility model provides a kind of vapor-liquid separator of partition wall type heat pump rectification, it is related to rectification equipment technical field, including separator shell, the upper of separator shell is provided with inlet pipe, outlet pipe and liquid outlet, the inside fixed of separator shell has reversing tube, it is provided with several spiral baffle between reversing tube and separator shell inner wall, spiral wind channel is formed between the spiral baffle of adjacent upper and lower, the variable-diameter block of mutual symmetry is fixed between the upper and lower sidewall of spiral wind channel, the variable-diameter block includes fixed portion, reducing portion, narrow neck portion and releasing diameter portion from front to back, accelerating channel is provided between the two narrow neck portions of upper and lower.The utility model can make steam of spiral conveying produce pressure drop when in variable-diameter portion position, promote liquid drop in steam to separate and gather into larger droplet, so that droplet is more easily separated by centrifugal force, to achieve the purpose of conveying dry steam, avoid droplet to destroy subsequent heat pump rectification compressor.

Description

Technical Field

[0001] This utility model relates to the field of distillation equipment technology, specifically to a vapor-liquid separator for indirect heat pump distillation. Background Technology

[0002] Heat pump distillation is a highly efficient and energy-saving distillation technology. It significantly reduces energy consumption by compressing and heating the low-temperature heat source in the overhead vapor phase of the distillation column, then using it as a high-temperature heat source for heating the reboiler in the reboiler. In indirect heat pump systems, the overhead vapor phase of the distillation column is typically exchanged with deionized water via a falling film evaporator. The deionized water absorbs the heat from the overhead vapor phase to generate low-pressure steam. This steam typically has a flow rate of 5–30 m / s and a volumetric flow rate of 100–2000 m³ / min. High-velocity steam often carries a large number of droplets or foam, forming supersaturated steam. If these droplets or foam directly enter the compressor, it can cause liquid slugging, leading to compressor damage. Therefore, before the steam enters the heat pump system, droplets or foam must be separated by a vapor-liquid separator to ensure that the steam entering the compressor is pure and dry.

[0003] Typically, the height of a cyclone separator is limited, and it is necessary to maintain the liquid level inside the separator. Due to this limitation, the installation space for the cyclone separator is limited, and the overall length of the cyclone channel is restricted. This results in some small droplets not being completely centrifuged when the steam flows out of the cyclone channel, and some droplets still entering the compressor along with the steam. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this invention provides a vapor-liquid separator for indirect heat pump distillation, which solves the problems mentioned in the background section.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A gas-liquid separator for indirect heat pump distillation includes a separator shell. An inlet pipe and an outlet pipe are symmetrically arranged on the upper side of the separator shell. A liquid outlet is provided at the bottom of the separator shell. A reversing pipe is fixed inside the separator shell. Several spiral baffles are arranged between the reversing pipe and the inner wall of the separator shell. A spiral air duct is formed between adjacent spiral baffles. A variable diameter block is fixed between the upper and lower side walls of the spiral air duct. An acceleration channel is formed between two upper and lower variable diameter blocks.

[0009] Preferably, the variable diameter block includes a fixed part, a reduced diameter part, a narrow neck, and a widening diameter part from front to back. The fixed part is bolted to the spiral baffle. The reduced diameter part is inclined upward. The narrow neck is parallel to the spiral baffle. The widening diameter part is inclined downward. The acceleration channel is located between the upper and lower narrow necks.

[0010] Preferably, an umbrella-shaped liquid separator plate is welded and fixed to the inner wall of the separator housing. The umbrella-shaped liquid separator plate is provided with a plurality of drip holes. The umbrella-shaped liquid separator plate is provided with a reversing pipe at its lower end. A turning gap is provided between the upper side wall of the umbrella-shaped liquid separator plate and the reversing pipe.

[0011] Preferably, the outer diameter of the umbrella-shaped liquid separator plate is smaller than the inner diameter of the separator shell, and a number of connecting blocks are welded at intervals along the lower edge of the umbrella-shaped liquid separator plate, and the connecting blocks are bolted to the inner wall of the separator shell.

[0012] Preferably, an inclined partition plate is fixed inside the separator housing, which divides the interior of the separator housing into an outlet chamber and a separation chamber. The inlet pipe is connected to the separation chamber, and the outlet pipe is connected to the outlet chamber.

[0013] Preferably, a wire mesh demister is fixed to the lower end of the reversing pipe.

[0014] (III) Beneficial Effects

[0015] This invention provides a vapor-liquid separator for indirect-wall heat pump distillation. It offers the following advantages:

[0016] 1. In this invention, supersaturated steam carrying liquid droplets enters the separator shell and rotates centrifugally along the spiral air duct. Under the action of centrifugal force, the liquid droplets are separated from the steam. When the steam passes through the variable diameter block, a spiral-shaped Venturi tube is formed between the variable diameter block and the spiral air ducts on the front and rear sides. The steam velocity increases in the narrow neck, which reduces the pressure in this part. The pressure drop causes the liquid droplets in the supersaturated steam to precipitate out and agglomerate with the liquid droplets or foam carried in the steam to form larger droplets. These larger droplets are more easily separated from the steam under the action of centrifugal force, thus achieving the purpose of drying the steam. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a vapor-liquid separator for indirect heat pump distillation according to the present invention;

[0018] Figure 2 This is a schematic diagram of the spiral baffle in this utility model;

[0019] Figure 3 This is a schematic diagram of the variable diameter block in this utility model.

[0020] In the diagram: 1. Separator housing; 2. Inlet pipe; 3. Outlet pipe; 4. Liquid outlet; 5. Reversing pipe; 6. Divider plate; 7. Spiral baffle; 8. Umbrella-shaped liquid distribution plate; 9. Variable diameter block; 91. Fixing part; 92. Reduction section; 93. Narrow neck; 94. Expansion section. Detailed Implementation

[0021] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0022] This utility model provides a vapor-liquid separator for indirect-wall heat pump distillation, such as... Figure 1 As shown, the separator includes a separator housing 1. An inlet pipe 2 and an outlet pipe 3 are symmetrically arranged on the upper side of the separator housing 1. A liquid outlet 4 is provided at the bottom of the separator housing 1. A reversing pipe 5 is fixed inside the separator housing 1. An inclined partition plate 6 is fixed inside the separator housing 1, dividing the interior of the separator housing 1 into an outlet chamber and a separation chamber. The lower ends of the inlet pipe 2 and the reversing pipe 5 communicate with the separation chamber. The outlet pipe 3 and the reversing pipe 5... The upper end of the separator is connected to the exhaust chamber. Several spiral baffles 7 are arranged between the reversing pipe 5 and the inner wall of the separator housing 1. The spiral baffles 7 are inclined downwards from the outside to the inside, forming a spiral air duct between adjacent spiral baffles 7. An umbrella-shaped liquid separator plate 8 is welded and fixed to the inner wall of the separator housing 1. Several drip holes are provided on the umbrella-shaped liquid separator plate 8. The reversing pipe 5 is positioned below the umbrella-shaped liquid separator plate 8. A space is provided between the upper side wall of the umbrella-shaped liquid separator plate 8 and the reversing pipe 5. The umbrella-shaped liquid separator 8 has a turning clearance, and its outer diameter is smaller than the inner diameter of the separator housing 1. Several connecting blocks are welded at intervals along the lower edge of the umbrella-shaped liquid separator 8. These connecting blocks are bolted to the inner wall of the separator housing 1. High-temperature steam containing liquid droplets enters the separation chamber of the separator housing 1 through the inlet pipe 2 and is transported along the spiral duct. The centrifugal force generated by the rotation pushes the liquid droplets in the steam outwards, causing them to impact and contact the inner wall of the separator housing 1 and the spiral baffle 7, and then... The steam flows to the bottom of the separator housing 1 through the spiral baffle 7. The steam is blown out from the spiral duct and hits the upper side of the umbrella-shaped liquid separator plate 8. Under the guidance of the upper side wall of the umbrella-shaped liquid separator plate 8, the steam turns. The droplets will hit and adhere to the umbrella-shaped liquid separator plate 8 under the action of inertia and gradually accumulate into a liquid flow. It drips from the drip hole and the gap between the umbrella-shaped liquid separator plate 8 and the inner wall of the separator housing 1 to the lower side of the separator housing 1. After the steam turns, it enters the gas outlet chamber through the turning pipe and is discharged as dry steam from the gas outlet pipe 3.

[0023] like Figures 2-3As shown, symmetrical variable diameter blocks 9 are fixed between the upper and lower sidewalls of the spiral duct. The variable diameter block 9 includes a fixed part 91, a reduced diameter part 92, a narrow neck 93, and a widening diameter part 94 from front to back. The fixed part 91 is bolted to the spiral baffle 7. The lower side of the fixed part is in concave-convex fit with the sidewall of the spiral baffle 7. The reduced diameter part 92 is inclined upward, and the widening diameter part 94 is inclined downward. The narrow neck 93 is connected to the top of the reduced diameter part 92 and the widening diameter part 94. The narrow neck 93 is parallel to the spiral baffle 7. An acceleration channel is provided between the upper and lower narrow necks 93.

[0024] Working principle:

[0025] High-temperature steam enters the spiral duct and is spiraled downwards. The centrifugal force generated can push the droplets to separate from the steam. The variable diameter block 9 and the spiral ducts on its front and rear sides together form a Venturi-like structure. After the high-temperature steam spirally transported enters the acceleration channel between the narrow necks 93, the steam velocity in this part will increase while the flow rate remains constant, generating a greater centrifugal force. According to Bernoulli's principle, the steam pressure in the acceleration channel will decrease. This pressure drop will make it easier for the supersaturated steam droplets to precipitate out and coalesce with the droplets or foam entrained in the steam to form larger droplets. These larger droplets are more easily separated from the steam under the action of centrifugal force, resulting in dry steam and preventing droplets from entering the compressor and causing liquid slugging.

[0026] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A vapor-liquid separator for indirect-flow heat pump distillation, comprising a separator shell, characterized in that: The separator housing has an air inlet pipe and an air outlet pipe symmetrically arranged on its upper side. The separator housing has a liquid outlet at its bottom. A reversing pipe is fixed inside the separator housing. Several spiral baffles are arranged between the reversing pipe and the inner wall of the separator housing. A spiral air duct is formed between the upper and lower adjacent spiral baffles. A variable diameter block is fixed between the upper and lower side walls of the spiral air duct. An acceleration channel is formed between the upper and lower variable diameter blocks.

2. The vapor-liquid separator for indirect heat pump distillation according to claim 1, characterized in that: The variable diameter block includes a fixed part, a reduced diameter part, a narrow neck, and a widening diameter part from front to back. The fixed part is bolted to the spiral baffle. The reduced diameter part is inclined upward. The narrow neck is parallel to the spiral baffle. The widening diameter part is inclined downward. The acceleration channel is located between the upper and lower narrow necks.

3. The vapor-liquid separator for indirect heat pump distillation according to claim 2, characterized in that: The inner wall of the separator housing is welded and fixed with an umbrella-shaped liquid distribution plate. The umbrella-shaped liquid distribution plate is provided with a number of drip holes. The umbrella-shaped liquid distribution plate is provided with a reversing pipe at its lower end. A turning gap is provided between the upper side wall of the umbrella-shaped liquid distribution plate and the reversing pipe.

4. The vapor-liquid separator for indirect heat pump distillation according to claim 3, characterized in that: The outer diameter of the umbrella-shaped liquid separator plate is smaller than the inner diameter of the separator shell. Several connecting blocks are welded at intervals along the lower edge of the umbrella-shaped liquid separator plate, and the connecting blocks are bolted to the inner wall of the separator shell.

5. A vapor-liquid separator for indirect-flow heat pump distillation according to claim 4, characterized in that: An inclined partition plate is fixed inside the separator housing, which divides the interior of the separator housing into an outlet chamber and a separation chamber. The inlet pipe is connected to the separation chamber, and the outlet pipe is connected to the outlet chamber.

6. The vapor-liquid separator for indirect-flow heat pump distillation according to claim 5, characterized in that: A wire mesh demister is fixed to the lower end of the reversing pipe.

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