Moisture pretreatment device of air separation system

Abstract

The moisture pretreatment device of the air separation system comprises a gas-liquid separator and a connector which are arranged on a gas conveying pipe, two output ends of the connector are respectively connected with a gas pipe and a water pipe, an automatic steam trap is arranged on the water pipe, the gas pipe is connected with a molecular sieve, and the gas conveying pipe is arranged in an inclined mode. The connecting end of the gas conveying pipe and the connector is the bottom end. The effects of prolonging the service life of the molecular sieve and improving the working efficiency are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of water pretreatment, in particular to a water pretreatment device for an air separation system. Background Art

[0002] The molecular sieve of the air separation unit is also called the molecular sieve purification system. The molecular sieve purification system uses the characteristics of the molecular sieve to achieve efficient purification of impurities in the air through adsorption, desorption and other steps, providing high-quality air for the stable operation of the air separation equipment. That is, the adsorption method is used to remove moisture, acetylene, carbon dioxide and some adsorbable hydrocarbons in the raw air to ensure the normal operation of the air separation equipment; once moisture enters the cold box plate heat exchanger and distillation tower of the air separation unit, it will cause catastrophic consequences for the air separation, and the air separation will be unable to produce, and in serious cases, the equipment will be damaged.

[0003] Existing air separation equipment generally adopts air-cooling tower for preliminary water washing, purification and cooling to initially remove dust and solid impurities in the air and wash and remove acidic gases. The gas enters the molecular sieve purification system through the bottom of the molecular sieve through a pipeline to further remove free water and some impurities. However, after the gas passes through the air-cooling tower for water washing, some water will enter the molecular sieve pipeline. If the amount of water is large or the production gas pressure fluctuates, it will also cause more water to be carried at the outlet of the air-cooling tower, increase the load of the molecular sieve, and may cause a molecular sieve water accident. Summary of the invention

[0004] The technical problem to be solved by the utility model is that the water content in the air after water washing is large and easily causes the accident of molecular sieve carrying water.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is: a moisture pretreatment device for an air separation system, comprising a gas-liquid separator and a connector arranged on an air pipe, the two output ends of the connector are respectively connected to the air pipe and the water pipe, an automatic drain valve is arranged on the water pipe, the air pipe is connected to a molecular sieve, the air pipe is arranged obliquely, and the connection end of the air pipe and the connector is the bottom end.

[0006] Preferably, the gas-liquid separator includes a gas-liquid inlet pipe and an exhaust pipe respectively arranged on the side wall and the top of the tank body, a separator pipe is arranged in the tank body, the exhaust pipe inlet end is located inside the separator pipe, the gas-liquid inlet pipe output end is located outside the separator pipe, and a drain pipe is arranged at the bottom of the tank body and connected to the bottom end of the separator pipe.

[0007] Preferably, the partition tube is located at the inner bottom of the tank body, and a communicating hole is provided at the bottom of the partition tube.

[0008] Preferably, water guide grooves are vertically arranged on both the inner and outer walls of the separation tube.

[0009] Preferably, a liquid level gauge is arranged on the water pipe, and branch pipes are arranged in parallel on the water pipe, and the automatic steam trap and the hand valve are respectively arranged on the branch pipes.

[0010] The utility model provides a moisture pretreatment device for an air separation system, which realizes gas-liquid separation twice by arranging the originally horizontally arranged gas pipeline obliquely and connecting the vertically arranged connector. The gas in the gas pipeline passes through a gas-liquid separator and then passes through the connector, and the liquid in the gas-liquid separator is discharged from the bottom, and the separated liquid in the connector enters a water pipe and is discharged through an automatic steam trap, thereby realizing gas-liquid separation treatment of air intake of the air separation system and improving the working efficiency and operation stability of the molecular sieve. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0012] Figure 1 It is a structural schematic diagram of an embodiment of the utility model.

[0013] Figure 2 Schematic diagram of the internal structure of the gas-liquid separator in the embodiment of the utility model.

[0014] In the figure: 1. gas transmission pipe; 2. gas-liquid separator; 21. tank body; 22. gas-liquid inlet pipe; 23. exhaust pipe; 24. drain pipe; 25. separator pipe; 26. connecting hole; 27. water guide groove; 3. connector; 4. hand valve; 5. automatic steam trap; 6. liquid level meter. DETAILED DESCRIPTION

[0015] like Figure 1 and Figure 2 The utility model provides a moisture pretreatment device for an air separation system, comprising a gas-liquid separator 2 and a connector 3 arranged on an air pipeline 1, wherein two output ends of the connector 3 are respectively connected to an air pipeline and a water pipeline, an automatic water trap 5 is arranged on the water pipeline, the air pipeline is connected to a molecular sieve, the air pipeline 1 is arranged obliquely, and the connection end of the air pipeline 1 and the connector 3 is the bottom end.

[0016] After being washed with water, the air enters the gas pipe 1. After entering the gas-liquid separator 2, the air undergoes the first step of gas-liquid separation through the gas-liquid separator 2. After the separation, the gas enters the connector 3 through the gas pipe 1. Due to the inclined arrangement of the gas pipe 1, the liquid moves directly downward after entering the connector 3 due to the different specific gravities of the gas and the liquid, and the upward movement of the gas makes it difficult to drive the downward-moving liquid to move upward, thereby achieving further gas-liquid separation. The separated liquid is discharged through the automatic steam trap 5 on the water pipe, and the gas enters the molecular sieve through the air pipe.

[0017] like Figure 1 and Figure 2The gas-liquid separator 2 comprises a gas-liquid inlet pipe 22 and an exhaust pipe 23 respectively arranged on the side wall and the top of the tank body 21, a separation pipe 25 is arranged inside the tank body 21, the inlet end of the exhaust pipe 23 is located inside the separation pipe 25, the outlet end of the gas-liquid inlet pipe 22 is located outside the separation pipe 25, and a drain pipe 24 is arranged at the bottom of the tank body 21 and communicated with the bottom end of the separation pipe 25.

[0018] The gas enters the tank body 21 through the gas-liquid inlet pipe 22. Since the partition tube 25 partitions the interior of the tank body 21, the entrance end of the exhaust pipe 23 is located inside the partition tube 25. The air enters the exhaust pipe 23 after passing through the partition tube 25. The liquid in the air adheres to the partition tube 25 and the inner wall of the tank body 21, and the liquid flows out from the drain pipe 24 to achieve gas-liquid separation.

[0019] like Figure 2 As shown, in order to ensure that the water outside the partition tube 25 enters the drain pipe 24. The partition tube 25 is located at the bottom of the tank body 21, and a connecting hole 26 is provided at the bottom of the partition tube 25.

[0020] like Figure 2 As shown, in order to facilitate the liquid attached to the partition tube 25 to flow down in streams, water guide grooves 27 are vertically arranged on the inner and outer walls of the partition tube 25. After the liquid is attached to the inner or outer wall of the partition tube 25, the liquid flows vertically downward through the water guide grooves 27, further reducing the water content in the air.

[0021] like Figure 1 As shown. A liquid level meter 6 is arranged on the water pipe, and a branch pipe is arranged in parallel on the water pipe, and the automatic steam trap 5 and the hand valve 4 are arranged on the branch pipe respectively. The water in the water pipe is discharged through the automatic steam trap 5. During the discharge process, if the discharge rate is lower than the water inlet rate of the water pipe, the liquid level in the water pipe rises, and the liquid level in the water pipe is monitored by the liquid level meter 6. After the liquid level in the water pipe rises to a value close to the set value, the hand valve 4 is manually opened to discharge the water in the water pipe.

Claims

1. The moisture pretreatment device of the air separation system is characterized by: The invention comprises a gas-liquid separator (2) and a connector (3) arranged on a gas transmission pipe (1); two output ends of the connector (3) are respectively connected to a gas pipe and a water pipe; an automatic water trap (5) is arranged on the water pipe; the gas pipe is connected to a molecular sieve; the gas transmission pipe (1) is arranged obliquely, and the connection end of the gas transmission pipe (1) and the connector (3) is the bottom end.

2. The moisture pretreatment device of the air separation system according to claim 1, characterized in that: The gas-liquid separator (2) comprises a gas-liquid inlet pipe (22) and an exhaust pipe (23) respectively arranged on the side wall and the top of the tank body (21); a separation pipe (25) is arranged inside the tank body (21); an inlet end of the exhaust pipe (23) is located inside the separation pipe (25); an outlet end of the gas-liquid inlet pipe (22) is located outside the separation pipe (25); and a liquid discharge pipe (24) is arranged at the bottom of the tank body (21) and is in communication with the bottom end of the separation pipe (25).

3. The moisture pretreatment device of the air separation system according to claim 2, characterized in that: The partition tube (25) is located at the bottom of the tank body (21), and a communication hole (26) is provided at the bottom of the partition tube (25).

4. The moisture pretreatment device of the air separation system according to claim 3, characterized in that: Water guide grooves (27) are vertically arranged on both the inner and outer walls of the separation tube (25).

5. The moisture pretreatment device of the air separation system according to claim 1, characterized in that: A liquid level meter (6) is arranged on the water pipe, and branch pipes are arranged in parallel on the water pipe, and the automatic drain valve (5) and the hand valve (4) are respectively arranged on the branch pipes.

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