Freezing dryer system for preparing nitrogen from membrane

Abstract

The utility model discloses a refrigeration dryer system for membrane nitrogen making, which comprises a heat exchanger, a precooler, a precooler, an evaporator, a gas-liquid separator, a compressor and a condenser, the heat exchanger is connected with the precooler, the precooler is connected with the precooler, the precooler is connected with the evaporator and the heat exchanger, and the compressor is connected with the compressor. The evaporator, the compressor, the condenser and the thermostatic expansion valve are sequentially connected to form a circulating refrigerating system; the device is good in integrality and convenient to control, can ensure that the outlet temperature is above 50 DEG C, and meets the requirement of membrane nitrogen-making temperature.

Description

Technical Field

[0001] The utility model relates to a cold dryer system for membrane nitrogen production. Background Art

[0002] Cold dryer is the abbreviation of refrigerated dryer. Although it has been used in many fields, it still has certain limitations in the process of use. For example, in the field of membrane nitrogen production, the outlet temperature of the existing cold dryer is about 30℃, especially in winter, the outlet temperature is lower, which cannot meet the demand of membrane nitrogen production inlet temperature above 50℃. During use, it can only meet the requirements by adding heaters to heat up. This increases energy consumption and production costs to a certain extent, and is inconsistent with the concept of energy saving. At the same time, the cold dryer, filter, and heater are supplied separately, and the overall system equipment layout is not compact enough, which does not meet the requirements of compact container space. Again, the cold dryer and heater are supplied separately, and the control system is controlled separately, and the control is decentralized, which is not conducive to the overall system control. Therefore, it is necessary to develop a cold dryer system suitable for the membrane nitrogen production field. Summary of the invention

[0003] The technical problem to be solved by the utility model is to provide a membrane nitrogen production cold dryer system which is convenient to use, has a reasonable layout, good integrity, is easy to control, can ensure that the outlet temperature is above 50°, meets the requirements of membrane nitrogen production temperature, and has practicality and wide application.

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

[0005] A membrane nitrogen production cold dryer system comprises a heat exchanger, a front cooler, a precooler, an evaporator, a gas-liquid separator, a compressor and a condenser, wherein the heat exchanger is connected to the front cooler, the front cooler is connected to the precooler, the precooler is connected to the evaporator and the heat exchanger, and the evaporator, the compressor, the condenser and the thermal expansion valve are connected in sequence to form a circulating refrigeration system.

[0006] Preferably, a gas-liquid separator is provided between the compressor and the evaporator.

[0007] Preferably, a pre-filter and a post-filter are installed in the air inlet direction and the air outlet direction of the heat exchanger respectively.

[0008] Preferably, a bypass regulating valve 1 and a bypass regulating valve 2 are respectively provided between the heat exchanger and the pre-filter and the post-filter.

[0009] Preferably, a regulating valve is provided between the pre-filter and the pre-cooler.

[0010] Preferably, a hot gas bypass valve is connected between the compressor, the thermal expansion valve and the gas-liquid separator, and the outside of the pipeline is heated by the hot gas bypass valve.

[0011] The beneficial effects of the utility model are:

[0012] 1. By adding a heat exchanger, the compressed air at the outlet of the conventional cold dryer is exchanged with the imported high-temperature air to ensure that the outlet temperature is 50°C.

[0013] 2. By adding regulating valves, bypass regulating valve 1 and bypass regulating valve 2, the flow rate of hot air in the heat exchanger can be adjusted to ensure that the outlet temperature is 50°C.

[0014] 3. By setting up a hot gas bypass valve, ensure that the ambient temperature of the equipment is below 0°C in winter. In view of the risk of freezing of the drainage system, install a heating tape to ensure that the drainage system is unobstructed.

[0015] 4. It is easy to use, has a reasonable layout, good integrity, is easy to control, and meets the temperature requirements of membrane nitrogen production. It is practical and widely used. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] 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.

[0017] Figure 1 It is a schematic diagram of the system principle of the utility model.

[0018] Among them, 1. pre-filter, 2. regulating valve, 3. heat exchanger, 4. pre-cooler, 5. pre-cooler, 6. evaporator, 7. thermal expansion valve, 8. gas-liquid separator, 9. compressor, 10. condenser, 11. hot gas bypass valve, 12. post-filter, 13. air inlet, 14. drain outlet, 15. air outlet, 161. bypass regulating valve one, 162. bypass regulating valve two. DETAILED DESCRIPTION

[0019] See also Figure 1 A membrane nitrogen production cold dryer system is shown, comprising a heat exchanger 3, a precooler 4, a precooler 5, an evaporator 6, a gas-liquid separator 8, a compressor 9 and a condenser 10, wherein the heat exchanger 3 is connected to the precooler 4, the precooler 4 is connected to the precooler 5, the precooler 5 is connected to the evaporator 6 and the heat exchanger 3, and the evaporator 6, the compressor 9, the condenser 10 and the thermal expansion valve 7 are connected in sequence to form a circulating refrigeration system.

[0020] Furthermore, a gas-liquid separator is provided between the compressor 9 and the evaporator 6 .

[0021] Furthermore, a pre-filter 1 and a post-filter 12 are installed in the air inlet direction and the air outlet direction of the heat exchanger 3 respectively.

[0022] Furthermore, a bypass regulating valve 1 161 and a bypass regulating valve 2 162 are respectively provided between the heat exchanger 3 and the pre-filter 1 and the post-filter 12 .

[0023] Furthermore, a regulating valve 2 is provided between the pre-filter 1 and the pre-cooler 4 .

[0024] Furthermore, a hot gas bypass valve 11 is connected between the compressor, the thermal expansion valve and the gas-liquid separator.

[0025] Furthermore, an air inlet 13 is provided at one end of the pre-filter, and an air outlet 15 is provided at one end of the post-filter.

[0026] Furthermore, the pre-filter, the post-filter and the evaporator are all connected with a sewage outlet 14 .

[0027] Furthermore, there are multiple pre-filters and multiple post-filters.

[0028] When the utility model is used, the high-temperature compressed air is filtered through the pre-filter to remove dust, oil and other impurities carried by the gas, and then enters the heat exchanger to exchange heat with the dry air after freeze drying (the temperature of the air at the outlet of the equipment is increased, and a bypass regulating valve is set between the inlet and outlet of the heat exchanger hot end, and the distribution of the air flow is adjusted by the regulating valve to ensure that the outlet temperature of the equipment is controlled at 50°C). After the compressed air comes out of the heat exchanger, it enters the pre-cooler, and after being initially cooled by forced convection of the ambient air, it enters the precooler and exchanges heat with the low-temperature air coming out of the evaporator. The compressed air is heated by the evaporator and further cooled down, and then enters the evaporator to exchange heat with Freon and further cool down to 2-10℃ (the water vapor in the air is cooled and condensed into droplets, and the condensed water is separated from the compressed air through the gas-water separation device). The low-temperature compressed air after dehydration returns to the precooler, exchanges heat with the relatively high-temperature compressed air to return to the temperature, and then enters the heat exchanger to exchange heat with the imported high-temperature compressed air, and the temperature is raised to 50℃. The trace dust and oil in the air are filtered out by the post-filter, and then enters the subsequent membrane nitrogen production process to ensure the effect of membrane nitrogen production.

[0029] The utility model does not require a heating device, reduces operating power consumption, ensures that the outlet temperature of the equipment is constant at 50°C under various ambient temperatures through hot air and regulating valve adjustment, meets the inlet temperature requirement of membrane nitrogen production, integrates a filter, has a compact structure, and is small in size. It is centrally controlled by a control cabinet and avoids freezing of the drainage system.

[0030] 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 membrane nitrogen production cold dryer system, characterized in that: It includes a heat exchanger, a front cooler, a precooler, an evaporator, a gas-liquid separator, a compressor and a condenser. The heat exchanger is connected to the front cooler, the front cooler is connected to the precooler, the precooler is connected to the evaporator and the heat exchanger, and the evaporator, compressor, condenser and thermal expansion valve are connected in sequence to form a circulating refrigeration system.

2. A membrane nitrogen production refrigeration dryer system according to claim 1, characterized in that: A gas-liquid separator is provided between the compressor and the evaporator.

3. A membrane nitrogen production refrigeration dryer system according to claim 1, characterized in that: A pre-filter and a post-filter are respectively installed in the air inlet direction and the air outlet direction of the heat exchanger.

4. A membrane nitrogen production refrigeration dryer system according to claim 3, characterized in that: A bypass regulating valve 1 and a bypass regulating valve 2 are respectively arranged between the heat exchanger and the pre-filter and the post-filter.

5. A membrane nitrogen production refrigeration dryer system according to claim 3, characterized in that: A regulating valve is arranged between the pre-filter and the pre-cooler.

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