Mechanical air heater of movable membrane separation nitrogen making device

Abstract

The utility model discloses a mechanical air heater of a movable membrane separation nitrogen-making device, which comprises an upper barrel and a lower barrel which are connected with each other in a sealing manner, and heat exchange structures are arranged in the upper barrel and the lower barrel; the whole upper barrel is a cylindrical shell with an opening in the bottom, a heating medium outlet pipe is arranged on the side face of the upper barrel in a communicating mode, and a first connecting flange is fixedly arranged at the tail end of the heating medium outlet pipe and used for being communicated with an external waste gas concentration pipeline; the top of the lower barrel is opened; according to the air heater, air to be heated can be discharged only by passing through the involute-shaped flow channel, so that the retention time of the air to be heated in the air heater is prolonged; and meanwhile, the involute-shaped heat exchange structure is adopted, so that the contact area between the heating medium and the air to be heated is increased, and the heating efficiency of the heater is improved.

Description

Technical Field

[0001] The utility model relates to the field of air heaters, in particular to a mechanical air heater of a mobile membrane separation nitrogen making device. Background Art

[0002] Membrane separation nitrogen production refers to the use of air as raw material. Under certain pressure conditions, oxygen and nitrogen are separated by different permeation rates of gases with different properties in the membrane. This method has the advantages of simpler structure, smaller size, no switching valve, and less maintenance. It is particularly suitable for small and medium-sized nitrogen users and has higher nitrogen purity. Before the compressed air enters the membrane group, the temperature of the compressed air needs to be raised to a certain temperature range. Generally, a heater is installed before the membrane group to heat the compressed air.

[0003] For example, the patent with authorization announcement number CN221846640U discloses a membrane nitrogen generator, comprising two groups of horizontal mounting frames arranged in parallel vertically, and a first pipe clamp and a second pipe clamp are respectively provided on both sides of the horizontal mounting frames. A compressed air buffer tank and a gas heating tank are arranged in parallel on one side of the horizontal mounting frame through the first pipe clamp, and a first membrane separation tank and a second membrane separation tank are arranged in parallel on the other side through the second pipe clamp. A heater is provided in the gas heating tank, and the output end of the compressed air buffer tank is connected to the upper end input port of the first membrane separation tank and the second membrane separation tank through an upper three-way pipe, and the bottom output port of the first membrane separation tank and the second membrane separation tank is connected to the bottom of the gas heating tank through a lower three-way pipe. An air outlet pipe is provided on the side of the gas heating tank, and a pipeline assembly is connected to the compressed air buffer tank.

[0004] The above patent adopts a gas heating tank for heating treatment, and the heater is an electric heating tube, which heats the gas in the gas heating tank by energizing it; however, the disadvantage of the above patent is that the electric heating tube, although highly efficient, has high energy consumption.

[0005] Therefore, it is necessary for us to improve such a structure to overcome the above-mentioned defects. Utility Model Content

[0006] The purpose of the utility model is to provide a mechanical air heater for a mobile membrane separation nitrogen production device to solve the problems raised in the above background technology.

[0007] To achieve the above objectives, the present invention provides the following technical solutions:

[0008] A mobile membrane separation nitrogen production device mechanical air heater comprises an upper cylinder and a lower cylinder which are sealed to each other, and a heat exchange structure is provided inside the upper cylinder and the lower cylinder; the upper cylinder is a cylindrical shell with an opening at the bottom, and a heating medium outlet pipe is provided on the side of the upper cylinder, wherein the end of the heating medium outlet pipe is fixedly provided with a first connecting flange for communicating with an external exhaust gas concentrated pipeline; the top of the lower cylinder is provided with an opening and is sealed to the upper cylinder; at the same time, a support leg is welded to the bottom of the side wall of the lower cylinder, and at least three support frames are provided and arranged in a circular array; the lower cylinder The bottom of the body is arranged in an arc shape, and a heating medium inlet pipe is connected to the bottom center of the lower cylinder; an air exhaust pipe is arranged at the upper left end of the lower cylinder, and an air inlet pipe is arranged at the lower right end of the lower cylinder; the heat exchange structure includes an upper end plate and a lower end plate, and also includes a heat exchange shell connected between the upper end plate and the lower end plate, wherein the heat exchange shell as a whole is involute shape, and a medium cavity for the heating medium to pass through is opened inside the heat exchange shell, and the upper and lower openings of the medium cavity are set, correspondingly, the upper end plate and the lower end plate are respectively provided with a medium outlet and a medium inlet; the medium outlet and the medium inlet are both involute shape.

[0009] Furthermore, a second connecting flange is fixedly provided on the bottom of the upper cylinder, and a third connecting flange is fixedly provided on the top of the lower cylinder. The second connecting flange and the third connecting flange are fixedly connected by bolts.

[0010] Furthermore, the air exhaust pipe and the air inlet pipe are respectively provided with a fourth connecting flange and a fifth connecting flange; and the end of the heating medium inlet pipe is fixedly connected with a sixth connecting flange.

[0011] Furthermore, the outer end of the heat exchange shell abuts against the inner wall of the lower cylinder.

[0012] Furthermore, one end of the air exhaust pipe close to the lower cylinder passes through the lower cylinder and the heat exchange shell and is connected to the center of the heat exchange shell.

[0013] Furthermore, the air discharge pipe is arranged to be closed at the end portion close to the center of the heat exchange shell.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] Since the air compressor will generate a large amount of high-temperature exhaust gas in the nitrogen production system, the utility model facilitates the use of the high-temperature exhaust gas generated by the air compressor to heat the air to be heated; at the same time, in this solution, the air to be heated needs to pass through an involute flow channel before it can be discharged, which increases the residence time of the air to be heated in the air heater; at the same time, the use of the involute heat exchange structure also increases the contact area between the heating medium and the air to be heated, thereby improving the heating efficiency of the heater. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the structure of the mechanical air heater of the mobile membrane separation nitrogen production device.

[0017] Figure 2 This is a front view of the mechanical air heater of the mobile membrane separation nitrogen production device.

[0018] Figure 3 This is a side view of the mechanical air heater of the mobile membrane separation nitrogen production device.

[0019] Figure 4 This is a top view of the mechanical air heater of the mobile membrane separation nitrogen production device.

[0020] Figure 5 for Figure 2 Cross-sectional view along the BB direction.

[0021] Figure 6 for Figure 2 Cross-sectional view along CC direction.

[0022] Figure 7 for Figure 3 Cross-sectional view along the AA axis.

[0023] Figure 8 This is a schematic diagram of the heat exchange structure in the mechanical air heater of a mobile membrane separation nitrogen production device. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. The components of the embodiments of the present invention generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the utility model for protection, but merely represents selected embodiments of the present invention. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0025] Since the air compressor generates a large amount of high-temperature exhaust gas in the nitrogen production system, the high-temperature exhaust gas generated by the air compressor is used to heat the air to be heated in this solution.

[0026] See also Figure 1-8The mobile membrane separation nitrogen production device mechanical air heater comprises an upper cylinder 1 and a lower cylinder 2 which are sealed and connected to each other, and a heat exchange structure 5 is provided inside the upper cylinder 1 and the lower cylinder 2;

[0027] The upper cylinder 1 is a cylindrical shell with an opening at the bottom, and a heating medium outlet pipe 101 is connected to the side of the upper cylinder 1. The end of the heating medium outlet pipe 101 is fixedly provided with a first connecting flange 102 for connecting to an external exhaust gas pipeline.

[0028] The top of the lower cylinder 2 is open and sealed with the upper cylinder 1; at the same time, the bottom of the side wall of the lower cylinder 2 is welded with a support leg 204, and at least three support legs 204 are provided and arranged in a circular array;

[0029] Specifically, a second connecting flange 103 is fixedly provided at the bottom of the upper cylinder 1, and a third connecting flange 201 is fixedly provided at the top of the lower cylinder 2. The second connecting flange 103 and the third connecting flange 201 are fixedly connected by bolts; a sealing gasket is provided between the second connecting flange 103 and the third connecting flange 201 for sealing the connection between the second connecting flange 103 and the third connecting flange 201;

[0030] The bottom of the lower cylinder 2 is arranged in an arc shape, and a heating medium inlet pipe 202 is connected to the center of the bottom of the lower cylinder 2; the end of the heating medium inlet pipe 202 is fixedly connected to a sixth connecting flange 203;

[0031] The heating medium inlet pipe 202 is used to communicate with the high-temperature exhaust gas of the air compressor; the heating medium (high-temperature exhaust gas) enters between the upper cylinder 1 and the lower cylinder 2 through the heating medium inlet pipe 202, heats the air, and is discharged from the heating medium outlet pipe 101;

[0032] An air outlet pipe 3 is provided at the upper left end of the lower cylinder 2, and an air inlet pipe 4 is provided at the lower right end of the lower cylinder 2. The air outlet pipe 3 and the air inlet pipe 4 are respectively provided with a fourth connecting flange 301 and a fifth connecting flange 401;

[0033] The heat exchange structure 5 includes an upper end plate 501 and a lower end plate 502, and also includes a heat exchange shell 503 connected between the upper end plate 501 and the lower end plate 502, wherein the heat exchange shell 503 is in an involute shape as a whole, and a medium cavity 506 for the heating medium to pass through is provided inside the heat exchange shell 503, and the medium cavity 506 is provided with upper and lower openings. Correspondingly, a medium outlet 504 and a medium inlet 505 are respectively provided on the upper end plate 501 and the lower end plate 502; the medium outlet 504 and the medium inlet 505 are both in an involute shape.

[0034] When the present invention is in use, the heat-conducting medium enters the lower end plate 502 from the heating medium inlet pipe 202, enters the medium cavity 506 through the medium inlet 505, and then is discharged from the medium outlet 504, and finally discharged from the heating medium outlet pipe 101;

[0035] like Figure 6 As shown, the outer end of the heat exchange shell 503 is in contact with or sealed against the inner wall of the lower cylinder 2; the outer wall of the heat exchange shell 503 and the interior of the lower cylinder 2 form a flow channel for the air to be heated; Figure 5 As shown, the air to be heated enters the flow channel through which the air to be heated passes from the air inlet pipe 4, passes through the channel formed by the outer wall of the involute-shaped heat exchange shell 503, and finally converges to the center of the heat exchange shell 503, while the end of the air exhaust pipe 3 close to the lower cylinder 2 passes through the lower cylinder 2 and the heat exchange shell 503 and is connected to the center of the heat exchange shell 503; the air gathered in the center of the heat exchange shell 503 is finally discharged from the air exhaust pipe 3.

[0036] At the same time, in this solution, the air exhaust pipe 3 is arranged to be closed at the end close to the center of the heat exchange shell 503.

[0037] In the description of the present invention, it should be noted that the terms "upper," "lower," "inner," "outer," "left," "right," and the like indicate positions or locations based on the positions shown in the accompanying drawings, or the positions or locations in which the product of the present invention is typically placed when in use, or the positions or locations commonly understood by those skilled in the art. These terms are intended solely to facilitate the description of the present invention and simplify the description, and are not intended to indicate or imply that the devices or components referred to must have a specific position, be constructed, or operate in a specific position. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and the like are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance. In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, terms such as "disposed" and "connected" should be understood broadly. For example, "connected" can mean a fixed connection, a detachable connection, or an integral connection; a mechanical connection or an electrical connection; a direct connection, an indirect connection through an intermediate medium, or internal communication between two components. A person of ordinary skill in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

Claims

1. A mechanical air heater for a mobile membrane separation nitrogen generator comprises an upper cylinder and a lower cylinder which are sealed to each other, and a heat exchange structure is provided inside the upper cylinder and the lower cylinder; the characteristics are: The upper cylinder is a cylindrical shell with an opening at the bottom, and a heating medium outlet pipe is connected to the side of the upper cylinder, wherein the end of the heating medium outlet pipe is fixedly provided with a first connecting flange for communicating with an external exhaust gas collection pipeline; the top of the lower cylinder is open and is sealed with the upper cylinder; at the same time, support legs are welded to the bottom of the side wall of the lower cylinder, and at least three support legs are provided and arranged in a circular array; the bottom of the lower cylinder is arranged in an arc shape, and a heating medium inlet pipe is connected to the center of the bottom of the lower cylinder; an air exhaust pipe is provided at the upper left end of the lower cylinder, and an air inlet pipe is provided at the lower right end of the lower cylinder; the heat exchange structure includes an upper end plate and a lower end plate, and also includes a heat exchange shell connected between the upper and lower end plates, wherein the heat exchange shell is generally involute shape, and a medium cavity for the heating medium to pass through is provided inside the heat exchange shell, and the medium cavity is provided with upper and lower openings. Correspondingly, a medium outlet and a medium inlet are respectively provided on the upper and lower end plates; both the medium outlet and the medium inlet are involute shape.

2. The mechanical air heater of the mobile membrane separation nitrogen generator according to claim 1, characterized in that: A second connecting flange is fixedly provided at the bottom of the upper cylinder, and a third connecting flange is fixedly provided at the top of the lower cylinder. The second connecting flange and the third connecting flange are fixedly connected by bolts.

3. The mechanical air heater of the mobile membrane separation nitrogen generator according to claim 1, characterized in that: The air exhaust pipe and the air inlet pipe are respectively provided with a fourth connecting flange and a fifth connecting flange; the end of the heating medium inlet pipe is fixedly connected with a sixth connecting flange.

4. The mechanical air heater of the mobile membrane separation nitrogen generator according to claim 1, characterized in that: The outer end of the heat exchange shell abuts against the inner wall of the lower cylinder.

5. The mechanical air heater of the mobile membrane separation nitrogen generator according to claim 1, characterized in that: One end of the air exhaust pipe close to the lower cylinder passes through the lower cylinder and the heat exchange shell and is communicated with the center of the heat exchange shell.

6. The mechanical air heater of the mobile membrane separation nitrogen production device according to claim 5, characterized in that: The air discharge pipe is arranged with a closed end at the end close to the center of the heat exchange shell.

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