Instrument air secondary dehydration system

Abstract

The utility model discloses an instrument air secondary dehydration system which comprises an air inlet pipe and an air outlet pipe, a drying tank is arranged between the air inlet pipe and the air outlet pipe, the drying tank comprises a tank body and a tank cover, the tank body and the tank cover are fixedly connected through a flange, a drying cavity is further formed in the tank body, and the drying cavity is communicated with the air inlet pipe. The air inlet pipe and the air outlet pipe are communicated with the drying cavity; alkali filtering assemblies are arranged at the two ends of the drying cavity, fixing steps matched with the alkali filtering assemblies are arranged at the two ends of the drying cavity, and the portion, between the two alkali filtering assemblies, in the drying cavity is filled with caustic soda flakes; the drying cavity is filled with caustic soda flakes through the caustic soda flakes filling cavity composed of the tank body and the filter screen, compressed air enters the drying cavity through the caustic soda flakes air inlet to be dried, the compressed air makes full contact with the caustic soda flakes, trace water carried by the compressed air is absorbed, and the compressed air subjected to secondary drying enters an instrument air system through the air storage tank.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical instruments, in particular to an instrument air secondary dehydration system. Background Art

[0002] The temperature in the north is low in winter. According to the requirements of SH / T 3020-2013 "Petrochemical Instrument Gas Supply Design Specification", the dew point of the instrument gas source under operation and (online) pressure should be at least 10°C lower than the historical annual (seasonal) extreme minimum temperature of the device location. Generally, after the compressed air passes through the air compressor, an instrument air drying system is set up. The system mainly includes air storage tanks, precision filters, dryers, etc. The compressed air delivered is to meet the instrument work. When the dew point is about -35°C, it cannot meet the air supply standards in extreme cold weather in the north.

[0003] Compressed air contains water with relative humidity. As it cools in the pipeline, the water will precipitate in the compressed air system. If there is water, it will bring many disadvantages to users: increase operation and maintenance costs, that is, the maintenance costs of instruments, solenoid valves, cylinders and other components will increase; the equipment has low working efficiency and may cause production interruptions; after the compressed air is initially dried using a dryer, the water cannot be completely removed, so a secondary dehydration is required to further improve the drying effect. Utility Model Content

[0004] In order to overcome the defects of the prior art, the technical problem to be solved by the utility model is to propose an instrument air secondary dehydration system, which utilizes the water absorption characteristics of alkali and uses alkali flakes to perform secondary dehydration on the compressed air, thereby meeting the instrument air supply standards in extreme weather in the cold north and improving the utilization efficiency of instruments, solenoid valves, cylinders, etc.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] The utility model provides an instrument air secondary dehydration system, comprising an air inlet pipe and an air outlet pipe, a drying tank is arranged between the air inlet pipe and the air outlet pipe, the drying tank comprises a tank body and a tank cover, the tank body and the tank cover are fixedly connected by a flange, a drying chamber is also arranged in the tank body, the drying chamber has a trapezoidal cross-section, an air inlet is arranged at the bottom of the tank body, an air outlet is arranged at the top of the tank cover, the air inlet is communicated with the air inlet pipe, and the air outlet is communicated with the air outlet pipe, so as to connect the air inlet pipe and the air outlet pipe with the drying chamber; alkali filter components are arranged at both ends of the drying chamber, fixed steps matched with the alkali filter components are provided at both ends of the drying chamber, and alkali flakes are filled between two groups of the alkali filter components in the drying chamber; an alkali discharge port is arranged on the tank body near the drying chamber, the alkali discharge port is connected to an external alkali discharge pipe by a flange, and three supporting feet are equally divided along the circumferential direction at the bottom of the tank body, and the supporting feet are integrally formed with the tank body.

[0007] An optimal technical solution of the utility model is that an air inlet valve is arranged on the pipeline communicating between the air inlet and the air inlet pipe, and an air outlet valve is arranged on the pipeline communicating between the air outlet and the air outlet pipe.

[0008] The preferred technical solution of the utility model is that the alkali filter assembly includes a fixed tray and a fixed frame, a filter screen is arranged between the fixed tray and the fixed frame, the fixed tray and the fixed frame are bolted to press the filter screen, and further, the top diameter of the drying chamber is larger than the bottom diameter to facilitate the removal and replacement of the filter screen.

[0009] An optimal technical solution of the utility model is that it also includes an intermediate pipeline, one end of which is connected to the air inlet pipe, and the other end of which is connected to the air outlet pipe, and the two ends of the intermediate pipeline are respectively integrally formed with the air inlet pipe and the air outlet pipe, and an intermediate valve is also provided on the intermediate pipeline. During dehydration and drying, the intermediate valve is in a closed state.

[0010] The beneficial effects of the utility model are:

[0011] (1) Use industrial caustic soda flakes to dehydrate the compressed air that has passed through the instrument air drying system for a second time, thereby meeting the instrument air supply standards for extreme weather in the cold north;

[0012] (2) The caustic soda flakes are filled into the drying chamber through the caustic soda filling chamber composed of the tank body and the filter screen. Compressed air enters the drying chamber through the air inlet for drying. The compressed air is fully in contact with the caustic soda flakes and absorbs the trace water carried by the compressed air. The compressed air after secondary drying enters the instrument air system through the air storage tank. At the same time, when the dew point of the compressed air cannot meet the local low-temperature environment air supply standard after detection, open the flange of the caustic soda flake outlet in time and replace the deliquesced caustic soda flakes;

[0013] (3) Through the flange connection between the tank body and the tank cover, the caustic soda discharge port is provided with a connecting flange, which is convenient for replacing caustic soda flakes and checking the filter. The filter is fixed with bolts, which is convenient for disassembly and replacement of the filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the principle of an instrument air secondary dehydration system provided in a specific implementation mode of the utility model;

[0015] Figure 2 It is a schematic diagram of the structure of a drying tank provided in a specific embodiment of the utility model;

[0016] Figure 3 It is a structural schematic diagram of the alkali filter assembly provided in a specific embodiment of the utility model;

[0017] Figure 4 It is an explosion schematic diagram of the alkali filter assembly provided in a specific embodiment of the utility model;

[0018] In the figure:

[0019] 1. Inlet pipe; 2. Outlet pipe; 3. Drying tank; 31. Tank body; 32. Tank cover; 30. Drying chamber; 311. Inlet port; 321. Outlet port; 4. Alkali filter assembly; 301. Fixed step; 5. Caustic flakes; 41. Fixed tray; 42. Fixed frame; 43. Filter screen; 312. Alkali outlet port; 313. Support foot; 6. Intermediate pipeline; 61. Intermediate valve; 3111. Inlet valve; 3211. Outlet valve. DETAILED DESCRIPTION

[0020] The technical solution of the utility model is further explained below with reference to the accompanying drawings and through specific implementation methods.

[0021] Example 1: Figures 1 to 4As shown, an instrument air secondary dehydration system includes an air inlet pipe 1 and an air outlet pipe 2, characterized in that: a drying tank 3 is arranged between the air inlet pipe 1 and the air outlet pipe 2, the drying tank 3 includes a tank body 31 and a tank cover 32, the tank body 31 and the tank cover 32 are fixedly connected by a flange, a drying chamber 30 is also arranged in the tank body 31, the cross-section of the drying chamber 30 is trapezoidal, an air inlet 311 is arranged at the bottom of the tank body 31, and an air outlet 321 is arranged at the top of the tank cover 32, the air inlet 311 is connected to the air inlet pipe 1, and the air outlet 321 is connected to the air outlet pipe 2, so as to connect the air inlet pipe 1 and the air outlet pipe 2 with the drying chamber 30; alkali filter components 4 are arranged at both ends of the drying chamber 30, and fixed steps 301 matched with the alkali filter components 4 are opened at both ends of the drying chamber 30, and caustic soda 5 is filled between two groups of alkali filter components 4 in the drying chamber 30. In this way, the compressed air from the drying system enters the drying chamber 30 through the air inlet pipe 1 and the air inlet 311, and then passes through the drying chamber 30 from bottom to top, and is further dehydrated by the caustic soda 5 in the drying chamber 30, that is, it absorbs the trace water carried by the compressed air for secondary dehydration, and then enters the air outlet pipe 2 through the air outlet 321 of the tank cover 32, and is finally supplied for use, thereby meeting the instrument air supply standard for extreme weather in the cold north. Furthermore, an air inlet valve 3111 is provided on the pipeline connecting the air inlet 311 and the air inlet pipe 1, and an air outlet valve 3211 is provided on the pipeline connecting the air outlet 321 and the air outlet pipe 2; to control air intake and air outlet, and further, three supporting feet 313 are equally divided along the circumferential direction at the bottom of the tank body 31, and the supporting feet 313 are integrally formed with the tank body 31; to support the drying tank 3.

[0022] Preferably, an alkali outlet 312 is provided on the tank body 31 near the drying chamber 30, and the alkali outlet 312 is connected to the external alkali outlet pipe by a flange. When the dew point of the compressed air fails to meet the local low-temperature environment air supply standard, the flange of the caustic soda flake outlet is opened in time to replace the deliquesced caustic soda flakes.

[0023] Preferably, in order to receive the flake caustic soda 5, the alkali filter assembly 4 includes a fixed tray 41 and a fixed frame 42, a filter screen 43 is arranged between the fixed tray 41 and the fixed frame 42, and the fixed tray 41 and the fixed frame 42 are bolted to compress the filter screen 43. When in use, the fixed tray 41 is placed on the fixed step 301. At the same time, the flake caustic soda is corrosive, so the filter screen 43 needs to be replaced regularly. The top diameter of the drying chamber 30 is larger than the bottom diameter to facilitate the removal of the replaced filter screen 43. When replacing, the alkali filter assembly 4 can be taken out as a whole and disassembled and replaced with a new filter screen 43.

[0024] Embodiment 2, as Figure 1As shown, the difference from Example 1 is that it also includes an intermediate pipeline 6, one end of the intermediate pipeline 6 is connected to the air inlet pipe 1, and the other end is connected to the air outlet pipe 2. The two ends of the intermediate pipeline 6 are respectively integrally formed with the air inlet pipe 1 and the air outlet pipe 2. The intermediate pipeline 6 is also provided with an intermediate valve 61. When dehydrating and drying, the intermediate valve 61 is in a closed state. In this way, when the drying tank 3 is overhauled, the air inlet valve 3111 and the air outlet valve 3211 can be closed, and the intermediate valve 61 can be opened, so that the entire circuit can still operate normally. After the overhaul is completed, the intermediate valve 61 is closed, and the air inlet valve 3111 and the air outlet valve 3211 are opened.

[0025] The present invention is described by preferred embodiments, and those skilled in the art will appreciate that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. The present invention is not limited to the specific embodiments disclosed herein, and other embodiments falling within the claims of this application are within the scope of protection of the present invention.

Claims

1. An instrument air secondary dehydration system, comprising an air inlet pipe (1) and an air outlet pipe (2), characterized in that: A drying tank (3) is arranged between the air inlet pipe (1) and the air outlet pipe (2), the drying tank (3) comprising a tank body (31) and a tank cover (32), the tank body (31) and the tank cover (32) being fixedly connected by a flange, a drying chamber (30) is further arranged in the tank body (31), the cross section of the drying chamber (30) is trapezoidal, an air inlet (311) is arranged at the bottom of the tank body (31), and an air outlet (321) is arranged at the top of the tank cover (32), the air inlet (311) is in communication with the air inlet pipe (1), and the air outlet (321) is in communication with the air outlet pipe (2), so that the air inlet pipe (1) and the air outlet pipe (2) are in communication with the drying chamber (30); Alkali filter assemblies (4) are arranged at both ends of the drying chamber (30), fixed steps (301) cooperating with the alkali filter assemblies (4) are provided at both ends of the drying chamber (30), and caustic soda flakes (5) are filled between two groups of the alkali filter assemblies (4) in the drying chamber (30).

2. The instrument air secondary dehydration system according to claim 1, characterized in that: An air inlet valve (3111) is provided on a pipeline communicating between the air inlet (311) and the air inlet pipe (1), and an air outlet valve (3211) is provided on a pipeline communicating between the air outlet (321) and the air outlet pipe (2).

3. The instrument air secondary dehydration system according to claim 1, characterized in that: The alkali filter assembly (4) comprises a fixed tray (41) and a fixed frame (42), a filter screen (43) is arranged between the fixed tray (41) and the fixed frame (42), and the fixed tray (41) and the fixed frame (42) are bolted to press the filter screen (43).

4. The instrument air secondary dehydration system according to claim 3, characterized in that: The top diameter of the drying chamber (30) is larger than the bottom diameter, so as to facilitate the removal and replacement of the filter screen (43).

5. The instrument air secondary dehydration system according to claim 1, characterized in that: An alkali discharge port (312) is provided on the tank body (31) near the drying chamber (30), and the alkali discharge port (312) is connected to an external alkali discharge pipe by using a flange.

6. The instrument air secondary dehydration system according to claim 1, characterized in that: The bottom of the tank body (31) is provided with three supporting feet (313) equally spaced along the circumferential direction, and the supporting feet (313) are integrally formed with the tank body (31).

7. The instrument air secondary dehydration system according to claim 1, characterized in that: The invention also comprises an intermediate pipeline (6), one end of which is connected to the air inlet pipe (1), and the other end of which is connected to the air outlet pipe (2), and the two ends of the intermediate pipeline (6) are respectively integrally formed with the air inlet pipe (1) and the air outlet pipe (2), and an intermediate valve (61) is also provided on the intermediate pipeline (6), and during dehydration and drying, the intermediate valve (61) is in a closed state.

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