Freezing dryer for PSA (Pressure Swing Adsorption) nitrogen making machine

Abstract

The utility model discloses a refrigeration dryer for a PSA (Pressure Swing Adsorption) nitrogen making machine, which comprises a refrigeration dryer main body, a side plate, a panel, a top plate, a bottom plate and a back plate are arranged outside the refrigeration dryer main body, an air inlet chamber is arranged on the top plate, an air inlet pipe is arranged on the air inlet chamber, an air outlet chamber is arranged on the panel, and an air outlet pipe is arranged on the air outlet chamber; an upper partition plate, a vertical plate, a middle partition plate, a lower partition plate and an inclined plate are arranged in the refrigeration dryer body, the vertical plate is arranged between the upper partition plate and the lower partition plate and divides the space between the upper partition plate and the lower partition plate into a precooler cavity and a second air channel, an evaporator heat exchange cavity is formed between the middle partition plate and the lower partition plate, and a condenser separation cavity is formed between the lower partition plate and the bottom plate. An air channel I is formed in the inner side of the back panel; under the condition that the operation power of the refrigeration dryer is consistent with that of a conventional refrigeration dryer, the temperature of an air outlet is lower than 25 DEG C, no liquid water is left, and the requirement of a PSA system for air at an inlet of an SPA nitrogen making machine is met.

Description

Technical Field

[0001] The utility model relates to a cold dryer for a PSA nitrogen generator. Background Art

[0002] During the use of the PSA nitrogen generator, affected by the adsorption characteristics of the PSA nitrogen generator, the lower the inlet temperature, the better the nitrogen production effect. In order to improve the use effect of the PSA nitrogen generator, there are generally two existing solutions. One is to install a cold dryer in front of the PSA nitrogen generator; the other is to install a precooler in front of the PSA nitrogen generator; but both methods have certain problems when used. The outlet temperature of the existing cold dryer is about 35°C, but for PSA, the inlet temperature of 35°C is too high, which has a great impact on the adsorption capacity of PSA, causing its adsorption capacity to drop sharply and fail to achieve the expected effect; while the precooler can meet the temperature requirements of PSA, but the equipment cost is higher than that of the cold dryer, and the installed power is higher than that of the cold dryer, that is, the operating cost is also correspondingly high, and the air carries trace amounts of liquid water, which affects the use effect and life of the PSA adsorbent. Therefore, it is necessary to develop a new type of cold dryer for nitrogen generators to solve the problems encountered in the current use of PSA nitrogen generators. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a cold dryer for a PSA nitrogen generator which has a practical and widely used operation mode and an outlet temperature lower than 25°C and no liquid water residue under the same operating power as a conventional cold dryer, thereby meeting the requirements of the PSA system for inlet air.

[0004] In order to solve the above problems, the utility model adopts the following technical solutions:

[0005] A cold dryer for a PSA nitrogen generator comprises a cold dryer body, wherein the exterior of the cold dryer body is provided with side panels, a panel, a top panel, a bottom panel and a back panel, wherein the top panel is provided with an air inlet chamber, an air inlet pipe is installed on the air inlet chamber, and the panel is provided with an air outlet chamber, an air outlet pipe is installed on the air outlet chamber; the interior of the cold dryer body is provided with an upper partition, a vertical panel, a middle partition, a lower partition and an inclined panel, wherein the vertical panel is arranged between the upper partition and the lower partition, and the vertical panel divides the space between the upper partition and the lower partition into a precooler chamber and an air channel 2, and a one-way valve is arranged between the air channel 2 and the air inlet chamber; an evaporator heat exchange chamber is formed between the middle partition and the lower partition, a condenser separation chamber is formed between the lower partition and the bottom panel, and an air channel 1 is arranged on the inner side of the back panel.

[0006] Preferably, the air inlet pipe, air inlet chamber, precooler chamber, evaporator heat exchange chamber, condensate separation chamber, air channel one, and air channel two are connected in sequence, and the air channel two, air inlet chamber, precooler chamber, air outlet chamber, and air outlet pipe are connected in sequence.

[0007] Preferably, a shunt channel is provided between the precooler cavity and the evaporator heat exchange cavity, and the cross-sectional area of ​​the shunt channel increases gradually from top to bottom.

[0008] Preferably, an aluminum plate heat exchanger is provided in the heat exchange chamber of the evaporator, and a refrigerant inlet and a refrigerant outlet are also installed on the panel, and the refrigerant inlet and the refrigerant outlet are connected to the aluminum plate heat exchanger.

[0009] The beneficial effects of the utility model are: easy to use and simple to operate. Through the arrangement of the air intake chamber, the precooler chamber, the evaporator heat exchange chamber, the condensate separation chamber, the air channel one, the air channel two, the air outlet chamber, the diversion channel, etc., the operating power of the cold dryer of the present application is consistent with that of a conventional cold dryer. During operation, the air outlet air temperature is lower than 25°C and there is no liquid water residue, which meets the requirements of the PSA system for the inlet air. The utility model is practical and widely used. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below, but this does not limit the protection scope of the utility model.

[0011] Figure 1 It is a schematic diagram of the structure of the utility model;

[0012] Figure 2 It is a cross-sectional schematic diagram of the utility model.

[0013] Among them, 1. side panel, 2. panel, 3. air outlet chamber, 4. air inlet chamber, 5. air inlet pipe, 6. air outlet pipe, 7. refrigerant inlet, 8. refrigerant outlet, 9. upper partition, 10. vertical plate, 11. middle partition, 12. lower partition, 13. inclined plate, 14. cavity one, 15. precooler cavity, 16. evaporator heat exchange cavity, 17. condensate separation cavity, 18. air channel one, 19. air channel two, 20. diversion channel, 21. top plate. DETAILED DESCRIPTION

[0014] See also Figure 1 to Figure 2A cold dryer for a PSA nitrogen generator shown in the figure comprises a cold dryer body, the exterior of the cold dryer body is provided with a side panel 1, a panel 2, a top panel 21, a bottom panel and a back panel, the top panel 21 is provided with an air inlet chamber 4, the air inlet chamber 4 is provided with an air inlet pipe 5, the panel 2 is provided with an air outlet chamber 3, the air outlet chamber 3 is provided with an air outlet pipe 6; the interior of the cold dryer body is provided with an upper partition 9, a vertical plate 10, a middle partition 11, a lower partition 12 and an inclined plate 13, the vertical plate 10 is arranged between the upper partition 9 and the lower partition 11, the vertical plate divides the space between the upper partition and the lower partition into a precooler chamber 15 and an air channel 2 19, a one-way valve (not shown) is provided between the air channel 2 19 and the air inlet chamber 4; an evaporator heat exchange chamber 16 is formed between the middle partition 11 and the lower partition 12, a condenser separation chamber 17 is formed between the lower partition 12 and the bottom panel, and an air channel 1 18 is provided on the inner side of the back panel.

[0015] Furthermore, the air inlet pipe, air inlet chamber, precooler chamber, evaporator heat exchange chamber, condensate separation chamber, air channel one, and air channel two are connected in sequence, and the air channel two, air inlet chamber, precooler chamber, air outlet chamber, and air outlet pipe are connected in sequence.

[0016] Furthermore, a shunt channel 20 is provided between the precooler chamber 15 and the evaporator heat exchange chamber 16, and the cross-sectional area of ​​the shunt channel gradually increases from top to bottom. This design ensures that the air transitions from the small channel of the precooling part to the large channel of the evaporation part, and the channel shunts evenly.

[0017] Furthermore, an aluminum plate heat exchanger (not shown) is provided in the evaporator heat exchange chamber 16, and a refrigerant inlet 7 and a refrigerant outlet 8 are also installed on the panel 2, and the refrigerant inlet 7 and the refrigerant outlet 8 are connected to the aluminum plate heat exchanger.

[0018] Furthermore, the upper partition, the middle partition, the lower partition and the inclined plate are connected to each other.

[0019] Furthermore, a drainage outlet (not shown) is provided at the bottom of the base plate.

[0020] The utility model reduces the heat exchange area of ​​the precooler cavity to ensure that the outlet temperature is lower than 25°C; at the same time, the structure of the precooler cavity is designed to avoid a sharp increase in pressure drop due to a smaller area.

[0021] When the utility model is used, the compressed air first passes through the air intake pipe and the air intake chamber to the precooler cavity, exchanges heat with the precooler for low-temperature air, and is initially cooled. Then, it passes through the diversion channel, transitions from the small channel of the precooler cavity to the large channel of the evaporator heat exchange cavity, and is evenly diverted into the evaporator (aluminum plate heat exchanger), fully exchanges heat with the Freon, and is further cooled to about 10°C. The water vapor in the air is cooled and condensed into droplets. In the condensed water separation cavity, the condensed water is separated from the compressed air by a wire mesh separation and gravity separation device, and is discharged from the drain port. The low-temperature compressed air after water removal returns to the precooler through air channel 1 and air channel 2, exchanges heat and warms up with the compressed air at the air inlet, and prevents trace liquid water from being brought to subsequent processes. The outlet temperature is controlled below 25°C. At the same time, the compressed air at the air inlet is limitedly cooled, the refrigeration capacity of the evaporator and the operating power of the whole machine are reduced, and the maximum energy recovery is utilized to achieve the purpose of energy saving.

[0022] The refrigerant inlet and the refrigerant outlet of the utility model are connected to the compressor, the expansion valve and the condenser. This refrigeration scheme is a conventional technical scheme, so it will not be described in detail.

[0023] The above are only specific implementations of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that are not conceived through creative work should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope defined in the claims.

Claims

1. A cold dryer for a PSA nitrogen generator, characterized in that: The invention comprises a cold dryer body, the exterior of which is provided with side panels, a panel, a top panel, a bottom panel and a back panel, the top panel is provided with an air inlet chamber, the air inlet chamber is provided with an air inlet pipe, the panel is provided with an air outlet chamber, the air outlet chamber is provided with an air outlet pipe; the interior of the cold dryer body is provided with an upper partition, a vertical panel, a middle partition, a lower partition and an inclined panel, the vertical panel is arranged between the upper partition and the lower partition, the vertical panel divides the space between the upper partition and the lower partition into a precooler chamber and an air channel 2, a one-way valve is arranged between the air channel 2 and the air inlet chamber; an evaporator heat exchange chamber is formed between the middle partition and the lower partition, a condenser separation chamber is formed between the lower partition and the bottom panel, and an air channel 1 is arranged on the inner side of the back panel.

2. A cold dryer for a PSA nitrogen generator according to claim 1, characterized in that: The air inlet pipe, the air inlet chamber, the precooler chamber, the evaporator heat exchange chamber, the condensate separation chamber, the air channel one, and the air channel two are connected in sequence, and the air channel two, the air inlet chamber, the precooler chamber, the air outlet chamber, and the air outlet pipe are connected in sequence.

3. A cold dryer for a PSA nitrogen generator according to claim 1, characterized in that: A shunt channel is provided between the precooler cavity and the evaporator heat exchange cavity, and the cross-sectional area of ​​the shunt channel increases gradually from top to bottom.

4. A cold dryer for a PSA nitrogen generator according to claim 1, characterized in that: An aluminum plate heat exchanger is arranged in the heat exchange cavity of the evaporator, and a refrigerant inlet and a refrigerant outlet are also installed on the panel, and the refrigerant inlet and the refrigerant outlet are connected to the aluminum plate heat exchanger.

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