Energy-saving adsorption column for producing nitrogen

Abstract

The utility model discloses an energy -saving adsorption tower for nitrogen making relates to chemical production equipment technical field, and the inside of tower body is provided with molecular sieve subassembly and gas partial flow subassembly, the molecular sieve subassembly includes two annular fixed frame fixed connection in the inner wall of tower body, and is installed with molecular sieve tray between two annular fixed frame, the rotating shaft rod is rotationally arranged in the center of annular fixed frame, and the inner wall fixed connection of tower body has the baffle, the utility model discloses a gas partial flow subassembly adopts two -layer partial flow structure of one -level partial flow gas pipe + two -level partial flow disc, and one -level partial flow gas pipe is circular ring shape, and after the raw material gas is dispersed initially and is transported to two -level partial flow disc through the intercommunication pipe of circular ring array distribution, realizes airflow secondary uniform distribution again through several uniform distribution air holes on two -level partial flow disc, can avoid raw material gas gathering in the local part in the tower body, ensures that airflow evenly passes through molecular sieve tray, and makes molecular sieve particle contact raw material gas fully.

Description

Technical Field

[0001] This utility model relates to the field of chemical production equipment technology, and in particular to an energy-saving adsorption tower for nitrogen production. Background Technology

[0002] Nitrogen, as an inert gas, is widely used in chemical production, electronics manufacturing, and food preservation. The performance of nitrogen production equipment directly affects production efficiency and cost control. Adsorption towers are the core equipment for nitrogen production via adsorption.

[0003] The following problems exist in the practical application of traditional nitrogen production adsorption towers: First, the gas distribution structure is unreasonable, and the raw gas is prone to local accumulation in the tower body. Some molecular sieve particles are difficult to fully contact with the raw gas, forming adsorption dead zones, which not only reduces the oxygen adsorption efficiency, but also affects the purity of nitrogen production. Second, the molecular sieve bed is mostly filled with a single particle size, which easily leads to insufficient particle adsorption and makes it difficult to balance structural stability and adsorption accuracy.

[0004] To address this, we designed an energy-saving adsorption tower for nitrogen production. Utility Model Content

[0005] This utility model discloses an energy-saving adsorption tower for nitrogen production. To achieve the above objectives, this utility model adopts the following technical solution: An energy-saving adsorption tower for nitrogen production includes a tower body, wherein a molecular sieve assembly and a gas diversion assembly are disposed inside the tower body. The molecular sieve assembly includes two annular fixed frames fixedly connected to the inner wall of the tower body, a molecular sieve disk installed between the two annular fixed frames, a rotating shaft rotatably arranged at the center of the annular fixed frames, a partition plate fixedly connected to the inner wall of the tower body, a gas drainage pipe fixedly embedded at the center of the partition plate, and the top end of the rotating shaft extending into the interior of the gas drainage pipe and rotatably connected to a gas drainage fan. The gas splitting assembly includes a primary splitting gas pipe fixedly connected to the inner wall of the tower body. The primary splitting gas pipe is in the shape of a ring. Several connecting gas pipes are fixedly embedded on the upper surface of the primary splitting gas pipe. A secondary splitting disk is fixedly connected to the inner wall of the tower body. Several evenly distributed gas holes are opened on the upper surface of the secondary splitting disk.

[0006] In a preferred embodiment, several connecting air tubes are evenly distributed in a circular array on the upper surface of the primary shunt air tube, and the top output end of the connecting air tube extends into the interior of the secondary shunt plate.

[0007] In a preferred embodiment, an air inlet pipe is fixedly embedded in the side of the tower body, the output end of the air inlet pipe extends into the interior of the primary diversion air pipe, a circulating air pipe is fixedly installed on the upper surface of the air inlet pipe, a switching air valve is fixedly installed at the bottom of the circulating air pipe, a circulating air pump is fixedly installed on the side of the tower body, the input end of the circulating air pump extends into the interior of the tower body, and the end of the circulating air pipe away from the air inlet pipe is fixedly connected to the output end of the circulating air pump.

[0008] In a preferred embodiment, the air inlet of the circulating air pump is located above the partition, an exhaust pipe is fixedly embedded at the top of the tower body, an exhaust valve is fixedly connected to the surface of the exhaust pipe, and an air inlet valve is fixedly connected to the surface of the air inlet pipe.

[0009] In a preferred embodiment, a plurality of strip-shaped rotating plates are fixedly connected to the surface of the rotating shaft, and the plurality of strip-shaped rotating plates are evenly distributed on the surface of the rotating shaft.

[0010] In a preferred embodiment, a buffer layer is fixedly disposed on the lower surface of the molecular sieve disk. The buffer layer consists of two layers: an upper layer of elastic polyurethane mesh and a lower layer of ceramic fiber felt. The buffer layer is used to absorb the impact energy of the airflow and reduce the friction of the molecular sieve particles.

[0011] In a preferred embodiment, the molecular sieve disc molecular sieve bed adopts a layered filling structure, with the upper layer being a coarse molecular sieve with a particle size of 2-3 mm and the lower layer being a fine molecular sieve with a particle size of 1-2 mm.

[0012] As can be seen from the above, the energy-saving adsorption tower for nitrogen production provided by this utility model has the following technical effects.

[0013] Firstly, the gas splitting assembly adopts a dual-layer splitting structure of a primary splitting pipe and a secondary splitting disk. The primary splitting pipe is in the shape of a ring. After the raw material gas is initially dispersed through the connecting pipes distributed in the ring array, it is delivered to the secondary splitting disk. Then, the airflow is evenly distributed again through several evenly distributed air holes on the secondary splitting disk. This can avoid the local accumulation of raw material gas in the tower body, ensure that the airflow passes through the molecular sieve disk evenly, and allow the molecular sieve particles to fully contact the raw material gas, thereby achieving uniform airflow distribution and greatly improving oxygen adsorption efficiency.

[0014] Secondly, in the molecular sieve assembly, when the duct fan inside the duct rotates with the airflow, it can drive the rotating shaft and the strip rotating plate on the surface to rotate synchronously. The strip rotating plate can disturb the airflow near the molecular sieve disk, break the local airflow stagnation zone, reduce the adsorption dead zone, further optimize the adsorption reaction conditions, and help increase the nitrogen production.

[0015] Thirdly, by setting a buffer layer at the bottom of the molecular sieve, the impact can be absorbed and the wear of particles can be reduced. The elastic polyurethane mesh can initially absorb the impact energy of the airflow and alleviate the direct impact of the raw material gas on the molecular sieve disk when it enters. The ceramic fiber felt can further buffer the vibration and reduce the mutual friction and collision of molecular sieve particles under the action of airflow, thus extending the replacement cycle of the molecular sieve. Attached Figure Description

[0016] Figure 1 This is a front view structural diagram of the present invention.

[0017] Figure 2 This is a schematic diagram of the orthographic structure of this utility model.

[0018] Figure 3 This is a schematic diagram of the internal structure of the tower body of this utility model.

[0019] Figure 4 for Figure 2 A magnified structural diagram of point A in the middle.

[0020] In the attached diagram: 1. Tower body; 2. Molecular sieve assembly; 3. Gas splitting assembly; 4. Inlet pipe; 5. Circulating gas pipe; 6. Switching gas valve; 7. Circulating gas pump; 8. Exhaust pipe; 9. Inlet valve; 101. Partition; 102. Drainage tube; 201. Annular fixing frame; 202. Molecular sieve disc; 203. Rotating shaft; 204. Drainage fan; 205. Strip rotating plate; 206. Buffer layer; 301. Primary shunt tube; 302. Connecting shunt tube; 303. Secondary shunt plate; 304. Uniformly distributed air vents. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0022] Reference Figures 1-4 An energy-saving adsorption tower for nitrogen production includes a tower body 1, with a gas diversion component 3, a molecular sieve component 2, and a partition plate 101 fixedly connected from top to bottom on the inner wall of the tower body 1.

[0023] The gas splitting assembly 3 is located on the lower part of the inner wall of the tower body 1, at the bottom of the adsorption reaction zone. Specifically, it includes a primary splitting gas pipe 301, a connecting gas pipe 302, and a secondary splitting plate 303. The primary splitting gas pipe 301 is in the shape of a ring and is horizontally fixed to the inner wall of the tower body 1. Its ring diameter is adapted to the inner diameter of the tower body 1 to ensure that it covers the transverse space inside the tower body 1. An inlet pipe 4 is fixedly embedded on the side of the tower body 1. The output end of the inlet pipe 4 extends laterally into the ring of the primary splitting gas pipe 301, which can directly transport the raw material gas into the primary splitting gas pipe 301. An inlet valve 9 is fixedly connected to the surface of the inlet pipe 4 to control the inlet rate and on / off of the raw material gas.

[0024] There are several connecting air tubes 302, which are evenly distributed in a circular array on the upper surface of the primary diversion air tube 301. Each connecting air tube 302 is a vertical tubular structure, with its lower end connected to the interior of the primary diversion air tube 301 and its upper end extending upward and penetrating into the interior of the secondary diversion disk 303, so as to realize the airflow connection between the primary diversion air tube 301 and the secondary diversion disk 303.

[0025] The secondary diversion plate 303 is a horizontal circular structure, fixedly connected to the inner wall of the tower body 1, and located directly above the primary diversion gas pipe 301. Several evenly distributed gas holes 304 are opened on the upper surface of the secondary diversion plate 303. The evenly distributed gas holes 304 are evenly distributed in a matrix or ring, covering the entire surface of the secondary diversion plate 303.

[0026] Through the double-layer diversion structure of primary diversion gas pipe 301 + connecting gas pipe 302 + secondary diversion plate 303, the raw gas first achieves initial lateral dispersion through the annular primary diversion gas pipe 301, and then is evenly transported to the secondary diversion plate 303 through the annular array of connecting gas pipes 302. Finally, it completes secondary uniform distribution through the uniformly distributed gas holes 304, which completely avoids the local accumulation of raw gas in the tower body 1, ensures that the airflow passes evenly upward through the molecular sieve component 2, and allows the molecular sieve particles to fully contact the raw gas, greatly improving the oxygen adsorption efficiency and laying the foundation for the production of high-purity nitrogen.

[0027] The molecular sieve assembly 2 is located in the middle of the inner wall of the tower body 1, directly above the secondary diversion plate 303 and directly below the partition plate 101. It includes two annular fixing frames 201, both of which are circular in shape and are horizontally fixed to the inner wall of the tower body 1, distributed in parallel vertically. A molecular sieve disk 202 is installed between the two annular fixing frames 201. The molecular sieve disk 202 is a horizontal circular disk structure, and its edge is fixedly connected to the inner wall of the annular fixing frame 201, which provides stable support.

[0028] The molecular sieve bed of the molecular sieve disk 202 adopts a layered filling structure. The upper layer is a coarse molecular sieve with a particle size of 2-3 mm, and the lower layer is a fine molecular sieve with a particle size of 1-2 mm. A buffer layer 206 is fixedly installed on the lower surface of the molecular sieve disk 202 (i.e. the side opposite to the secondary diversion disk 303). The buffer layer 206 consists of two layers: the upper layer is an elastic polyurethane mesh, and the lower layer is a ceramic fiber felt. The buffer layer 206 completely covers the lower surface of the molecular sieve disk 202.

[0029] The rotating shaft 203 has a vertical rod-like structure. Its lower end is rotatably set at the center of the lower annular fixed frame 201, and its upper end extends upward and passes through the molecular sieve disk 202 and the upper annular fixed frame 201, and finally extends into the interior of the drainage pipe 102. The top of the rotating shaft 203 located inside the drainage pipe 102 is rotatably connected to the drainage fan 204. The blades of the drainage fan 204 have a gap with the inner wall of the drainage pipe 102, and can rotate freely with the airflow.

[0030] There are several strip-shaped rotating plates 205, all of which are long strips and are fixedly connected to the surface of the rotating shaft 203. They are located between two annular fixed frames 201 and inside the molecular sieve disk 202. The strip-shaped rotating plates 205 are evenly distributed radially around the rotating shaft 203. Their length is adapted to the radius of the molecular sieve disk 202 and they can rotate synchronously with the rotating shaft 203.

[0031] It is worth noting that in the layered filling structure of the molecular sieve disk 202, the upper layer of coarse molecular sieve particles can withstand the impact of airflow and provide support for the lower layer of fine molecular sieve particles, preventing excessive compaction of fine particles. The lower layer of fine molecular sieve particles improves adsorption accuracy with its larger specific surface area, balancing structural stability and adsorption efficiency. On the other hand, the elastic polyurethane mesh of the buffer layer 206 can initially absorb the impact energy of airflow, and the ceramic fiber felt further buffers vibration and reduces friction and collision between molecular sieve particles, reducing the molecular sieve breakage rate and extending the molecular sieve replacement cycle. At the same time, when the flow fan 204 rotates with the airflow, it drives the rotating shaft 203 and the strip rotating plate 205 to rotate synchronously. The strip rotating plate 205 can disturb the airflow in the molecular sieve disk 202, break the local airflow stagnation zone, assist the slight movement of molecular sieve particles, reduce adsorption dead zones, further optimize adsorption reaction conditions, and increase the nitrogen production per unit time.

[0032] To achieve energy-saving operation and exhaust gas recovery, a circulating air pipe 5, a switching air valve 6, and a circulating air pump 7 are also installed on the side of the tower body 1, and an exhaust pipe 8 is installed at the top. The circulating air pump 7 is fixedly installed on the side of the tower body 1, and its input end extends into the interior of the tower body 1 through a pipe. The air inlet end is located in the exhaust gas temporary storage area above the partition 101, which can extract the exhaust gas after the adsorption reaction. The output end of the circulating air pump 7 is fixedly connected to one end of the circulating air pipe 5 through a pipe.

[0033] The other end of the circulating air pipe 5 is fixedly connected to the upper surface of the air inlet pipe 4, and a switching air valve 6 is fixedly installed at the bottom of the circulating air pipe 5. The switching air valve 6 is used to control the opening and closing of the circulating air pipe 5 and the airflow rate. The air inlet pipe 4 forms a closed-loop airflow channel with the circulating air pump 7 through the circulating air pipe 5.

[0034] The exhaust pipe 8 is fixedly embedded at the top of the tower body 1, with its upper end extending to the outside of the tower body 1; an exhaust valve is fixedly connected to the surface of the exhaust pipe 8.

[0035] Working principle: Open the intake valve 9 on the surface of the intake pipe 4, and the raw material gas is transported to the interior of the first-stage diversion pipe 301 through the intake pipe 4; after the raw material gas is initially dispersed laterally in the annular first-stage diversion pipe 301, it enters the second-stage diversion disk 303 evenly through the annular array of connecting pipes 302, and then completes the secondary distribution through the evenly distributed air holes 304 on the second-stage diversion disk 303, forming a uniform upward airflow.

[0036] A uniform airflow passes upward through the buffer layer 206. The elastic polyurethane mesh and ceramic fiber felt of the buffer layer 206 absorb the impact of the airflow and reduce vibration. The airflow then enters the molecular sieve disk 202. The coarse molecular sieve on the upper layer of the molecular sieve disk 202 first filters and adsorbs the airflow, while the fine molecular sieve on the lower layer precisely adsorbs the oxygen in the raw material gas. The remaining nitrogen continues to flow upward. When the upward-flowing nitrogen passes through the drainage pipe 102 in the center of the partition 101, it drives the drainage fan 204 in the drainage pipe 102 to rotate. The drainage fan 204 rotates synchronously with the rotating shaft 203 and the strip rotating plate 205. The strip rotating plate 205 disturbs the airflow and molecular sieve particles in the molecular sieve disk 202, reducing adsorption dead zones and improving adsorption efficiency.

[0037] After being adsorbed by the molecular sieve, the nitrogen enters the tail gas storage area above the partition 101. If the nitrogen purity meets the standard, the exhaust valve on the surface of the exhaust pipe 8 is opened, and the qualified nitrogen is discharged through the exhaust pipe 8. If there is incompletely separated tail gas (containing a small amount of oxygen and nitrogen) in the tail gas storage area, the circulating gas pump 7 is started, the switching gas valve 6 is opened, and the tail gas is drawn by the circulating gas pump 7 to the circulating gas pipe 5, and then merged into the inlet pipe 4 to mix with the new raw material gas. It then re-enters the primary diversion gas pipe 301 to participate in the adsorption process, thereby realizing the recycling of tail gas.

[0038] The above description is merely a preferred embodiment of this utility model, but the protection scope of this utility model is not limited thereto. The substitutions may be replacements of some structures, devices, or method steps, or they may be complete technical solutions. Equivalent substitutions or modifications made based on the technical solution and inventive concept of this utility model should all be covered within the protection scope of this utility model.

Claims

1. An energy-saving adsorption tower for nitrogen production, comprising a tower body (1), characterized in that, The tower body (1) is equipped with a molecular sieve assembly (2) and a gas splitting assembly (3). The molecular sieve assembly (2) includes two annular fixing frames (201) fixedly connected to the inner wall of the tower body (1), a molecular sieve disk (202) is installed between the two annular fixing frames (201), a rotating shaft (203) is rotatably arranged at the center of the annular fixing frame (201), a partition (101) is fixedly connected to the inner wall of the tower body (1), a drainage pipe (102) is fixedly embedded at the center of the partition (101), and the top end of the rotating shaft (203) extends into the interior of the drainage pipe (102) and is rotatably connected to a drainage fan (204). The gas splitting assembly (3) includes a primary splitting gas pipe (301) fixedly connected to the inner wall of the tower body (1). The primary splitting gas pipe (301) is in the shape of a ring. Several connecting gas pipes (302) are fixedly embedded on the upper surface of the primary splitting gas pipe (301). A secondary splitting disk (303) is fixedly connected to the inner wall of the tower body (1). Several evenly distributed gas holes (304) are opened on the upper surface of the secondary splitting disk (303).

2. The energy-saving adsorption tower for nitrogen production according to claim 1, characterized in that, Several connecting air tubes (302) are evenly distributed in a circular array on the upper surface of the primary diversion air tube (301), and the top output end of the connecting air tube (302) extends into the interior of the secondary diversion disk (303).

3. The energy-saving adsorption tower for nitrogen production according to claim 2, characterized in that, An air inlet pipe (4) is fixedly embedded on the side of the tower body (1). The output end of the air inlet pipe (4) extends into the interior of the first-level diversion pipe (301). A circulating air pipe (5) is fixedly installed on the upper surface of the air inlet pipe (4). A switching air valve (6) is fixedly installed at the bottom of the circulating air pipe (5). A circulating air pump (7) is fixedly installed on the side of the tower body (1). The input end of the circulating air pump (7) extends into the interior of the tower body (1). The end of the circulating air pipe (5) away from the air inlet pipe (4) is fixedly connected to the output end of the circulating air pump (7).

4. The energy-saving adsorption tower for nitrogen production according to claim 3, characterized in that, The air inlet of the circulating air pump (7) is located above the partition (101). The top of the tower body (1) is fixedly embedded with an exhaust pipe (8). An exhaust valve is fixedly connected to the surface of the exhaust pipe (8). An air inlet valve (9) is fixedly connected to the surface of the air inlet pipe (4).

5. An energy-saving adsorption tower for nitrogen production according to claim 4, characterized in that, The surface of the rotating shaft (203) is fixedly connected with several strip-shaped rotating plates (205), which are evenly distributed on the surface of the rotating shaft (203).

6. The energy-saving adsorption tower for nitrogen production according to claim 5, characterized in that, A buffer layer (206) is fixedly provided on the lower surface of the molecular sieve disk (202). The buffer layer (206) consists of two layers: an upper layer of elastic polyurethane mesh and a lower layer of ceramic fiber felt. The buffer layer (206) is used to absorb the impact energy of the airflow and reduce the friction of the molecular sieve particles.

7. An energy-saving adsorption tower for nitrogen production according to claim 6, characterized in that, The molecular sieve disc (202) adopts a layered filling structure, with the upper layer being a coarse molecular sieve with a particle size of 2-3 mm and the lower layer being a fine molecular sieve with a particle size of 1-2 mm.

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