CN203908143U - Novel ammonia refrigeration intercooler - Google Patents

Abstract

The utility model discloses a novel intercooler for ammonia refrigeration. A high-pressure ammonia liquid heat exchange coil is arranged in the tank body, and a tubular convection tube is welded in the center of the coil tube; the air guide pipe goes deep into the convection tube and the nozzle is provided with an air outlet screen. There are angled blades welded on the outer wall of the air duct, and there are gaps between the angled blades, and a tubular outer cylinder is welded on the angled blades; the gas-liquid separator tank is equipped with a separation plate and a baffle; The plate separates the tank, so that the ammonia vapor can only rise along the gap between the blades with angles; the baffle blocks the ammonia vapor, so that the ammonia vapor can only deflect and rise; the separation plate is provided with a liquid flow opening downward Pipe; the upper part of the intercooler tank is provided with an exhaust pipe for secondary compression. The utility model thoroughly removes the liquid ammonia carried in the ammonia vapor, improves the working efficiency and performance of the secondary compression, and improves the heat transfer coefficient of the coil by setting the convection tube, which is beneficial to the cooling of the high-pressure ammonia liquid in the coil .

Description

New Ammonia Refrigeration Intercooler

technical field

The utility model relates to an intercooler used in a double-stage compression ammonia refrigeration device, in which ammonia vapor is cooled after being compressed in the first stage before entering the second-stage compressor.

Background technique

Ammonia has excellent thermodynamic properties, and ammonia is generally used as a refrigerant in larger refrigeration systems. In practical application, when the required low temperature is lower than -20°C, two-stage compressors are generally used to complete the compression work. The first-stage compression sucks in the low-temperature steam from the evaporator, and discharges the medium-pressure superheated gas after compression.

The medium-pressure superheated gas is generally cooled to about 0°C through the intercooler, and the ammonia vapor saturation treatment is completed at the same time, followed by ammonia gas-liquid separation and then sucked into the high-pressure stage for compression again, and the high-temperature and high-pressure gas after two-stage compression is separated by oil removal After the condenser is washed to remove oil and saturated, the condenser is removed to complete the condensation and liquefaction.

Similar to the first-stage compression, the ammonia vapor of the second-stage compression cannot carry liquid ammonia, otherwise it will increase the power consumption of the ammonia compressor, resulting in a "tide car" and a serious cylinder knocking sound of the compressor, which is particularly easy to damage compressor,

The intercooler mainly performs three functions:

1. Perform scrubbing cooling and saturation on the superheated gas that has been compressed in the first stage;

2. After the gas-liquid separation of the saturated ammonia vapor, it is convenient for high-pressure stage compression;

3. Realize 0° cooling of the high-pressure ammonia liquid entering the low-pressure evaporation system.

The existing ammonia intercooler has the defects of incomplete gas-liquid separation and low coil cooling heat transfer coefficient during operation, and the effect is unsatisfactory.

Utility model content

The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a new type of intercooler for ammonia refrigeration. The liquid ammonia carried in the saturated ammonia vapor is removed, the influence of liquid ammonia on the secondary compression is eliminated to the greatest extent, the working efficiency and performance of the secondary compression are improved, power is saved, and the service life is prolonged; and by setting the convection cylinder The heat transfer coefficient of the coil is greatly improved, which is beneficial to the cooling of the high-pressure ammonia liquid in the coil, and has the characteristics of simple structure and strong practicability.

In order to overcome the deficiencies in the prior art, the utility model adopts the following technical solutions:

A new type of intercooler for ammonia refrigeration, including an intercooler tank, characterized in that: a high-pressure ammonia liquid heat exchange coil is installed in the intercooler tank, and a tubular convection tube is welded in the center of the coil; The superheated ammonia steam pipe goes deep into the convection cylinder through the air guide tube and the outlet of the tube is equipped with an air outlet screen cage. The outer wall of the air guide tube is welded with angled blades. There are gaps between the angled blades. The angled blades are welded with tubular The outer cylinder; the tank body of the gas-liquid separator is provided with an isolation plate and a baffle; the isolation plate separates the tank so that the ammonia vapor can only rise along the gap between the blades with an angle; the baffle blocks the ammonia vapor, The ammonia vapor can only be baffled and rises; the separation plate is provided with a liquid flow pipe opening downward; the upper part of the intercooler tank is provided with an exhaust pipe for secondary compression.

The tank body of the intercooler is provided with a liquid level gauge, which is convenient for observing and regulating the liquid level.

Due to the continuous gasification of liquid ammonia in the intercooler tank, the temperature inside the intercooler tank is very low. In order to isolate heat transfer, an insulation layer is provided on the outer wall of the intercooler tank to prevent the loss of cooling capacity.

When working, keep the liquid ammonia in the tank of the intercooler at an appropriate liquid level, and the superheated ammonia vapor from the first stage of compression is passed through the air duct to connect to the screen cage under the liquid surface, and the superheated ammonia vapor from the first stage of compression passes through the screen cage Diffusion is evenly discharged and contacts with liquid ammonia to achieve saturation of ammonia vapor and overflow the liquid surface. There is a certain distance between the bottom of the screen cage to avoid disturbing the lubricating oil deposited at the bottom.

The tubular outer cylinder, with inclined blades and a part of the outer wall of the air guide tube constitute the cyclone. During the rising process, the saturated ammonia vapor is blocked by the partition plate, and can only enter the upper layer of the partition plate through the gap between the swirler blades, and is blocked by the baffle plate. The action produces baffles. In order to ensure the effect of gas-liquid separation, it can be repeatedly baffled by the upper swirl blades and baffles of the same structure.

When the ammonia liquid surface overflows and the steam is isolated by the isolation plate, it can only flow through the gap between the blades, and the high-speed gas is forced to swirl by the blades, and the ammonia liquid is centrifugally scattered during the rising process of the swirling air flow, leaving the gas phase, realizing the first gas-liquid separate.

When the rotating air flow is blocked by the baffle, it can only be deflected and bypassed to generate a second inertial flow and turn to realize the second gas-liquid separation.

The saturated ammonia vapor continues to rise, and the previous two gas-liquid separation workflows can be repeated many times. The separated liquid ammonia returns to the liquid phase in the lower part of the tank through the liquid flow tube, realizing the complete separation of liquid ammonia in the saturated ammonia vapor. Finally, it enters the second stage of compression through the exhaust pipe.

Because the gas in the convection cylinder forms bubbles and rises, the average density of ammonia vapor and liquid in the convection cylinder is smaller than that outside the cylinder, and the gas-liquid mixture in the convection cylinder forms an upward flow, and the liquid ammonia outside the convection cylinder flows into the cylinder to form ammonia liquid outside the convection cylinder. downflow. This function produced by the convection cylinder strengthens the automatic convection circulation of the ammonia liquid in the intercooler tank, thus directly improving the heat transfer coefficient of the coil, effectively reducing the temperature at which the high-pressure ammonia liquid in the coil enters the evaporator, and is conducive to the evaporation and absorption of ammonia liquid More heat.

The utility model forms multiple forced gas-liquid separations in series through multiple swirls and baffle deflections during the rising process of the saturated ammonia vapor, and has a strong gas-liquid separation function. In addition, the cross-section of the gas-liquid separation tank is large, the airflow rises slowly, and the liquid droplets under the action of gravity naturally settle, so the gas-liquid separation is very thorough; at the same time, the automatic convection of the ammonia liquid in the tank is strengthened by setting a convection tube Circulation greatly improves the heat transfer coefficient of the coil, which is conducive to improving the working efficiency of the entire refrigeration device.

Compared with the prior art, the utility model has the beneficial effects of:

The structural design is particularly ingenious, and the direct contact between gas and liquid is rationally used to realize the rapid saturation of ammonia vapor; the multi-stage liquid separation and series connection ensure the complete separation of the liquid phase; The influence of ammonia on the secondary compression improves the working efficiency and performance of the compressor, saves electricity and prolongs the service life of the compressor; the automatic convection circulation of the ammonia liquid in the tank is strengthened by setting the convection cylinder, which greatly improves the efficiency of the coil. The heat transfer coefficient is good for improving the working efficiency of the whole refrigeration device.

Description of drawings

Figure 1 is a schematic plan view of the new ammonia refrigeration intercooler.

Fig. 2 is a schematic diagram of a three-dimensional structure of a cyclone.

Each label in the figure means:

1. Superheated ammonia steam pipe from the first stage of compression; 2. Liquid level gauge; 3. Liquid flow pipe; 4. Liquid level; 5. Blades with inclined angle; 6. Tubular outer cylinder; Cage; 9. Isolation plate; 10. Baffle; 11. Airflow path; 12. Gas-liquid separator tank; 13 Exhaust pipe; 14. High-pressure ammonia outlet; 15. Coil; 16. High-pressure ammonia inlet 17. Convection cylinder.

Detailed ways

Now in conjunction with accompanying drawing, the utility model is described in further detail.

As shown in Figure 1 and Figure 2, the new ammonia refrigeration intercooler includes a gas-liquid separator tank 12, and a coil 15 for high-pressure ammonia liquid heat exchange is arranged in the intercooler tank 12, and a tubular pipe is welded in the center of the coil. The convection cylinder 17; the superheated ammonia steam pipe 1 from the primary compression goes deep into the intercooler tank 12 through the air guide pipe 7, and the outlet of the pipe is provided with an air outlet screen cage 8, and the outer wall of the air guide pipe 7 is welded with blades 5 with an angle. There is a gap between the inclined blades, and a tubular outer cylinder 6 is welded on the inclined blades 5; an isolation plate 9 and a baffle plate 10 are arranged in the intercooler tank body 12; the isolation plate 9 separates the tank body, so that Ammonia vapor can only rise along the gap between the blades with an angle; the baffle plate 10 blocks the ammonia vapor, so that the ammonia vapor can only deflect and rise; the separation plate 9 is provided with a liquid flow pipe 3 opening downward; an intercooler The top of the tank body 12 is provided with an exhaust pipe 13 for secondary compression.

The tank body 12 of the intercooler is provided with a liquid level gauge 2 to facilitate observation and regulation of the liquid level 4 .

The outer wall of the intercooler tank body 12 is provided with an insulation layer to prevent the loss of cooling capacity.

During work, the liquid ammonia in the intercooler tank 12 is kept at an appropriate liquid level 4, and the superheated ammonia steam pipe 1 from the first-stage compression is passed through the air guide pipe 7 to connect to the screen cage 8 under the liquid surface, and the steam from the first-stage compression is connected to the screen cage 8 under the liquid surface. The superheated ammonia vapor diffuses through the sieve cage 8 and discharges evenly to contact with the liquid ammonia to realize saturation of the ammonia vapor and overflow the liquid surface 4. The sieve cage 8 has a certain distance from the bottom to avoid disturbing the lubricating oil deposited at the bottom.

The tubular outer cylinder 6, with the inclined blades 5 and a part of the outer wall of the air guide pipe 7 form a cyclone. During the rising process, the saturated ammonia vapor is blocked by the isolation plate 9 and can only enter the upper layer of the isolation plate 9 through the gap between the cyclone blades 5 , which is blocked by the baffle 10 to generate baffles. In order to ensure the gas-liquid separation effect, the baffles and baffles of the same structure are repeatedly deflected to generate the airflow path 11 as shown in FIG. 1 .

When the steam overflowing from the ammonia liquid surface is isolated by the isolation plate 9, it can only flow through the gaps of the blades 5, and the high-speed gas is forced to swirl by the blades 5, and the ammonia liquid is centrifugally scattered during the rising process of the swirling air flow, leaving the gas phase to achieve the first secondary gas-liquid separation.

When the rotating air flow is blocked by the baffle plate 10, it can only be deflected and bypassed to generate a second inertial flow and turn to realize the second gas-liquid separation.

The saturated ammonia vapor continues to rise, repeating the previous two gas-liquid separation workflows, and the liquid ammonia from the four gas-liquid separations returns to the liquid phase at the lower part of the tank through the liquid flow pipe 3, realizing the complete separation of liquid ammonia in the saturated ammonia vapor , and finally enter the second stage of compression through the exhaust pipe 13.

Because the gas in the convection cylinder 17 forms bubbles and rises, the average density of ammonia vapor and liquid in the convection cylinder 17 is smaller than that outside the cylinder body 17, and the gas-liquid mixture in the convection cylinder 17 forms an upward flow, and the flow of liquid ammonia outside the convection cylinder 17 is replenished into the cylinder body. A downflow of ammonia liquid is formed outside the convection cylinder. The function produced by the convection cylinder strengthens the automatic convection circulation of the ammonia liquid in the tank of the intercooler, thus directly improving the heat transfer coefficient of the coil 15, effectively reducing the temperature at which the high-pressure ammonia liquid in the coil enters the evaporator, and facilitating the evaporation of the ammonia liquid absorb more heat.

The above are only preferred embodiments of the utility model, and do not limit the utility model in any form. Any person familiar with the art, without departing from the scope of the technical solution of the present utility model, can use the technical content disclosed above to make many possible changes and modifications to the technical solution of the utility model, or modify it into an equivalent change, etc. effective example. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention shall fall within the protection scope of the technical proposal of the present invention.

Claims (3)

1. a novel ammonia refrigeration intercooler, comprises intercooler tank body, it is characterized in that: in intercooler tank body, be provided with the coil pipe of high pressure ammoniacal liquor heat exchange, coil pipe center is welded with the convective tube of tubulose; From the overheated ammonia steam pipe of one-level compression in wireway gos deep into convective tube and the mouth of pipe be provided with out air sifter cage, on wireway outer wall, be welded with blade with angle, gapped between blade with angle, on blade with angle, be welded with the urceolus of tubulose; In gas-liquid separator tank body, be provided with division board and flow-stopping plate; Division board separates tank body, and ammonia steam can only be risen on the gap between blade with angle; Flow-stopping plate blocks ammonia steam, makes ammonia steam increase by baffling; Division board is provided with the fluid flow tube under shed; Intercooler tank body top is provided with blast pipe and removes two-stage compression.

2. novel ammonia refrigeration intercooler according to claim 1, is characterized in that: described intercooler tank body is provided with liquid level gauge.

3. novel ammonia refrigeration intercooler according to claim 1, is characterized in that: intercooler tank wall is provided with heat-insulation layer.