Low-temperature methanol washing tail gas washing tower
By introducing a demineralized water circulation system and washing components into the exhaust gas scrubbing tower, the problem of insufficient gas-liquid contact in the design of ordinary float towers is solved, achieving efficient heat and mass transfer and emission compliance, while reducing energy consumption and costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HENAN JINKAI CHEM INVESTMENT HLDG GRP
- Filing Date
- 2025-05-19
- Publication Date
- 2026-06-09
AI Technical Summary
Existing exhaust gas scrubbing towers, without pipeline modifications, use a conventional float tower design, resulting in insufficient gas-liquid contact, low heat and mass transfer efficiency, and significant mist entrainment, failing to meet emission standards.
A low-temperature methanol tail gas scrubbing tower is designed. The tail gas and demineralized water are introduced into the scrubbing tower body through the inlet pipe and water pipe respectively. The heat exchanger, water pump and return pipe form a circulation. Combined with the scrubbing component and the demister component, the gas-liquid mixing and momentum exchange are realized, which improves the heat and mass transfer efficiency of the tower plate. The snap-fit component facilitates maintenance.
With the same tower diameter, the output of tower equipment can be significantly increased, energy consumption can be reduced, product quality can be improved, and costs can be reduced by recycling demineralized water, while meeting emission standards.
Smart Images
Figure CN224331844U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of scrubbing tower technology, specifically a low-temperature methanol tail gas scrubbing tower. Background Technology
[0002] Formaldehyde (HCHO) is a common volatile organic compound (VOC) widely present in the production processes of industries such as wood-based panel manufacturing, chemical synthesis, textile printing and dyeing, and anti-corrosion and disinfection. Direct emission of its exhaust gas not only pollutes the environment but also poses serious health risks (such as carcinogenicity and teratogenicity). Therefore, efficient and economical formaldehyde waste gas treatment technology has become one of the key research directions in the environmental protection field. In the low-temperature methanol washing tail gas process, a tail gas water scrubbing tower is required. Existing tail gas scrubbing towers, without pipeline modifications, can only be researched from the tower's internal components. Most related fields, both domestically and internationally, use ordinary float glass towers for design and operation. However, ordinary float glass towers cannot achieve sufficient gas-liquid contact, resulting in low heat and mass transfer efficiency and significant mist entrainment, leading to substandard exhaust gas emissions. Therefore, we propose a low-temperature methanol washing tail gas scrubbing tower. Utility Model Content
[0003] The technical problem this invention aims to solve is to overcome existing defects and provide a low-temperature methanol tail gas scrubbing tower. When the tail gas enters the tower body through the inlet pipe, demineralized water enters the U-shaped tube through the water pipe. Then, under the action of the heat exchanger, water pump, and reflux pipe, demineralized water at a suitable temperature enters the tower body. Under the action of the scrubbing components, the gas and liquid mix and exchange momentum, effectively improving the heat and mass transfer efficiency of the tower plates. This significantly increases the output of the tower equipment, reduces energy consumption, and improves product quality under the same tower diameter. The scrubbed gas is discharged to the outside through the exhaust pipe after being processed by the demister components. The demineralized water can be recycled under the action of the heat exchanger. When the demineralized water needs to be replaced, it is discharged through the water pipe, effectively solving the problems in the background technology.
[0004] To achieve the above objectives, this utility model provides the following technical solution: a low-temperature methanol tail gas scrubbing tower, comprising a bottom plate, a scrubbing tower body, a heat exchanger, and a snap-fit assembly;
[0005] A fixed bracket is fixedly installed on the middle of the outer side of the washing tower body. First legs are installed on both sides of the fixed bracket. Two base plates are provided, and the first legs are connected to their respective base plates. A tower cover is detachably connected to the upper part of the washing tower body via a snap-fit assembly. An exhaust pipe is installed on the upper part of the tower cover. An air inlet pipe is installed on the lower right side of the washing tower body. A U-shaped pipe is installed at the lower water outlet of the washing tower body. The other end of the U-shaped pipe is connected to the lower end of the heat exchanger. A water pipe is installed on the lower middle side of the U-shaped pipe, and a first control valve is installed on the water pipe. Second legs are installed on both sides of the heat exchanger, and the second legs are connected to their respective base plates. A water pump is installed on the heat exchanger, and a return pipe is installed on the water pump. The other end of the return pipe is connected to the upper left side of the washing tower body, and a second control valve is installed on the return pipe. A washing assembly is located inside the washing tower body, vertically positioned between the return pipe and the air inlet pipe on the washing tower body.
[0006] Furthermore, the washing assembly includes two trays installed sequentially in a vertical direction. A downcomer is installed on the right side of the upper tray and on the left side of the lower tray. Overflow plates are installed on both sides of the upper surface of the trays. Multiple air risers are evenly distributed in the middle of the trays, located between the two overflow plates. Multiple first caps are evenly distributed in the middle of the trays, with each first cap corresponding to an air riser. Multiple first sieve holes are evenly distributed on the upper part of the outer periphery of each first cap. A connecting plate is installed on the upper end of the outer periphery of each first cap. A sieve plate is installed on the lower part of the outer end of the connecting plate, with multiple second sieve holes evenly distributed on the sieve plate. The connecting plate and the sieve plate together form a second cap. Through grooves are provided on the lower part of the four outer sides of the first cap. As the gas rises through the riser holes on the tray into the first cap, the demineralized water flows into the first cap through the channel. Then, the gas and liquid mix and exchange momentum, impacting the top plate of the first cap and deflecting back, thus colliding violently with the rising gas and liquid. This causes the gas and liquid droplets to be ejected from the first sieve hole on the side wall of the first cap. The ejected gas-liquid mixture is then redispersed through the second sieve hole of the second cap's sieve plate, forming smaller droplets. The gas and liquid further transfer heat and mass, effectively improving the heat and mass transfer efficiency of the tray. Then, under the action of gravity and inertial separation, the gas rises and the liquid falls.
[0007] Furthermore, the snap-fit assembly includes a slot formed on the upper surface of the washing tower body, and a snap-fit block is installed on the lower surface of the tower cover. The snap-fit block and the slot are snap-fitted together. The tower cover can be removed or installed via the snap-fit block and the slot to facilitate maintenance of the interior of the washing tower body.
[0008] Furthermore, it also includes a demisting assembly, which comprises a demisting plate, bolts, and multiple mounting plates evenly installed above and inside the scrubbing tower body. The mounting plates have threaded holes, and the demisting plate is threadedly connected to these holes via bolts. The demisting plate can be replaced and maintained by removing the bolts.
[0009] Compared with the prior art, the beneficial effects of this utility model are as follows: In use, when the tail gas enters the main body of the washing tower through the inlet pipe, the demineralized water enters the U-shaped tube through the water pipe. Then, under the action of the heat exchanger, water pump and reflux pipe, the demineralized water at a suitable temperature enters the main body of the washing tower. Under the action of the washing components, the gas and liquid mix and exchange momentum, which can effectively improve the heat transfer and mass transfer efficiency of the tower plate. Under the same tower diameter, the output of the tower equipment is greatly increased, energy consumption is reduced and product quality is improved. The washed gas is discharged to the outside through the exhaust pipe after the action of the demister components. The demineralized water can be recycled under the action of the heat exchanger. When the demineralized water needs to be replaced, it is discharged through the water pipe. Attached Figure Description
[0010] Figure 1 This is a schematic diagram of the structure of this utility model;
[0011] Figure 2 This is a schematic cross-sectional view of the present invention.
[0012] Figure 3 This is a partially enlarged structural diagram of part A of this utility model.
[0013] In the diagram: 1. Base plate, 2. First control valve, 3. Water pipe, 4. U-shaped pipe, 5. Scrubbing tower body, 6. Fixed bracket, 7. Air inlet pipe, 8. First support leg, 9. Exhaust pipe, 10. Tower cover, 11. Return pipe, 12. Water pump, 13. Heat exchanger, 14. Second support leg, 15. Mounting plate, 16. Demisting plate, 17. Bolt, 18. Second control valve, 19. Overflow plate, 20. Downcomer, 21. Air inlet, 22. Tower plate, 23. Connecting plate, 24. Second sieve hole, 25. Through groove, 26. First cap, 27. Sieve plate, 28. First sieve hole, 29. Clamping block. Detailed Implementation
[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0015] Please see Figure 1-3This embodiment provides a technical solution: a low-temperature methanol tail gas scrubbing tower, including a bottom plate 1, a scrubbing tower body 5, a heat exchanger 13, and a snap-fit assembly;
[0016] A fixed bracket 6 is fixedly installed on the middle of the outer side of the washing tower body 5. First legs 8 are installed on both sides of the fixed bracket 6. Two base plates 1 are provided, and the first legs 8 are connected to the corresponding base plates 1. A tower cover 10 is detachably connected to the upper part of the washing tower body 5 via a snap-fit assembly. An exhaust pipe 9 is installed on the upper part of the tower cover 10. An air inlet pipe 7 is installed on the lower right side of the washing tower body 5. A U-shaped pipe 4 is installed at the lower outlet of the washing tower body 5. The other end of the U-shaped pipe 4 is connected to the lower end of the heat exchanger 13. The middle of the U-shaped pipe 4... A water pipe 3 is installed on the side, and a first control valve 2 is installed on the water pipe 3. Second legs 14 are installed on both sides of the heat exchanger 13, and the second legs 14 are respectively connected to the corresponding base plate 1. A water pump 12 is installed on the heat exchanger 13, and a return pipe 11 is installed on the water pump 12. The other end of the return pipe 11 is connected to the upper left side of the washing tower body 5. A second control valve 18 is installed on the return pipe 11. A washing assembly is provided inside the washing tower body 5. The washing assembly is located between the return pipe 11 and the air inlet pipe 7 on the washing tower body 5 in the vertical direction.
[0017] In this embodiment, a third control valve is installed on the intake pipe 7, and a fourth control valve is installed on the exhaust pipe 9;
[0018] During operation, exhaust gas enters the scrubbing tower body 5 through the inlet pipe 7, while demineralized water enters the U-shaped pipe 4 through the water pipe 3. Then, under the action of the heat exchanger 13, the water pump 12, and the return pipe 11, demineralized water at a suitable temperature enters the scrubbing tower body 5. Under the action of the scrubbing components, the gas and liquid mix and exchange momentum, which can effectively improve the heat and mass transfer efficiency of the tower plates. Under the same tower diameter, the output of the tower equipment is greatly increased, energy consumption is reduced, and product quality is improved. After being scrubbed, the gas is discharged to the outside through the exhaust pipe 9 after being demistered. The demineralized water can be recycled under the action of the heat exchanger 13. When the demineralized water needs to be replaced, it is discharged through the water pipe 3.
[0019] The washing assembly includes two trays 22 installed sequentially in a vertical direction. A downcomer 20 is installed on the right side of the upper tray 22 and on the left side of the lower tray 22. Overflow plates 19 are installed on both sides of the upper surface of the trays 22. Multiple air risers 21 are evenly distributed in the middle of the trays 22, located between the two overflow plates 19. Multiple first caps 26 are evenly distributed in the middle of the trays 22, with the first caps 26 and air risers 21 corresponding one-to-one. Multiple first sieve holes 28 are evenly distributed in the upper part of the outer periphery of the first caps 26. A connecting plate 23 is installed at the upper end of the outer periphery of the first caps 26. A sieve plate 27 is installed at the lower part of the outer end of the connecting plate 23. Multiple second sieve holes 24 are evenly distributed on the sieve plate 27. The connecting plate 23 and the sieve plate 27 enclose each other to form a second cap. Through grooves 25 are distributed in the lower part of the four outer sides of the first caps 26. When the gas rises upward through the riser hole 21 on the tray 22 into the first cap 26, the demineralized water flows into the first cap 26 through the channel 25. Then, the gas and liquid mix and exchange momentum, impacting the top plate of the first cap 26 and deflecting back, thus colliding violently with the rising gas and liquid. This causes the gas and liquid droplets to be ejected from the first sieve hole 28 on the side wall of the first cap 26. The ejected gas-liquid mixture is then redispersed through the second sieve hole of the sieve plate 27 of the second cap, forming smaller droplets. The gas and liquid further transfer heat and mass, which can effectively improve the heat and mass transfer efficiency of the tray. Then, under the action of gravity and inertial separation, the gas rises and the liquid falls.
[0020] The snap-fit assembly includes a slot formed on the upper surface of the washing tower body 5, and a snap-fit block 29 installed on the lower surface of the tower cover 10. The snap-fit block 29 and the slot are snap-fitted together. The tower cover 10 can be removed or installed via the snap-fit block 29 and the slot to facilitate maintenance of the interior of the washing tower body 5.
[0021] It also includes a demisting assembly, which consists of a demisting plate 16, bolts 17, and multiple mounting plates 15 evenly installed inside and above the scrubbing tower body 5. The mounting plates 15 have threaded holes, and the demisting plate 16 is threadedly connected to the threaded holes on the mounting plates 15 by bolts 17. The demisting plate 16 can be replaced and maintained by removing the bolts 17.
[0022] The working principle of the low-temperature methanol tail gas scrubbing tower provided by this utility model is as follows: During use, when the tail gas enters the scrubbing tower body 5 through the inlet pipe 7, the demineralized water enters the U-shaped pipe 4 through the water pipe 3. Then, under the action of the heat exchanger 13, the water pump 12 and the return pipe 11, the demineralized water at a suitable temperature enters the scrubbing tower body 5. Under the action of the scrubbing components, the gas and liquid mix and exchange momentum, which can effectively improve the heat transfer and mass transfer efficiency of the tower plate. Under the same tower diameter, the output of the tower equipment is greatly increased, energy consumption is reduced and product quality is improved. After being scrubbed, the gas is discharged to the outside through the exhaust pipe 9 after being extinguished by the demisting components. The demineralized water can be recycled under the action of the heat exchanger 13. When the demineralized water needs to be replaced, it is discharged through the water pipe 3. As the gas rises through the riser holes 21 on the tray 22 into the first cap 26, the demineralized water flows into the first cap 26 through the channel 25. The gas and liquid then mix and exchange momentum, impacting the top plate of the first cap 26 and deflecting back, causing a violent collision with the rising gas and liquid. This results in the gas and liquid droplets being ejected from the first sieve holes 28 on the side wall of the first cap 26. The ejected gas-liquid mixture is then redispersed through the second sieve holes of the second cap 27, forming smaller droplets. This further facilitates heat and mass transfer between the gas and liquid, effectively improving the heat and mass transfer efficiency of the tray. Furthermore, under the influence of gravity and inertial separation, the gas rises and the liquid descends. The tower cover 10 can be removed or installed via the locking blocks 29 and slots for maintenance of the interior of the scrubbing tower body 5. The demister plate 16 can be replaced and maintained by removing the bolts 17.
[0023] It is worth noting that in this embodiment, the water pump 12 can be freely configured according to the actual application scenario. The external controller controls the operation of the water pump 12 using methods commonly used in the prior art, and the content not described in detail in this specification belongs to the prior art known to those skilled in the art.
[0024] The above are merely embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.
Claims
1. A low-temperature methanol tail gas scrubbing tower, characterized in that: Includes a base plate (1), a scrubbing tower body (5), a heat exchanger (13), and a snap-fit assembly; A fixed bracket (6) is fixedly installed on the middle of the outer side of the washing tower body (5). First legs (8) are installed on both sides of the fixed bracket (6). The base plate (1) has two legs, and the first legs (8) are respectively connected to the corresponding base plates (1). The upper part of the washing tower body (5) is detachably connected to the tower cover (10) through a snap-fit assembly. An exhaust pipe (9) is installed on the upper part of the tower cover (10). An air inlet pipe (7) is installed on the lower right side of the washing tower body (5). A U-shaped pipe (4) is installed at the lower water outlet of the washing tower body (5). The other end of the U-shaped pipe (4) is connected to the lower end of the heat exchanger (13). The middle part of the U-shaped pipe (4) is lower A water pipe (3) is installed on the side, and a first control valve (2) is installed on the water pipe (3). A second support leg (14) is installed on both sides of the heat exchanger (13). The second support leg (14) is connected to the corresponding base plate (1). A water pump (12) is installed on the heat exchanger (13). A return pipe (11) is installed on the water pump (12). The other end of the return pipe (11) is connected to the upper left side of the washing tower body (5). A second control valve (18) is installed on the return pipe (11). A washing assembly is provided inside the washing tower body (5). The washing assembly is located between the return pipe (11) and the air inlet pipe (7) on the washing tower body (5) in the vertical direction.
2. The low-temperature methanol tail gas scrubbing tower according to claim 1, characterized in that: The washing assembly includes two trays (22) installed sequentially in a vertical direction. A downcomer (20) is installed on the right side of the upper tray (22), and a downcomer (20) is installed on the left side of the lower tray (22). Overflow plates (19) are installed on both sides of the upper surface of the trays (22). Multiple air risers (21) are evenly distributed in the middle of the trays (22), and the air risers (21) are located between the two overflow plates (19). Multiple first caps (26) are evenly distributed in the middle of the trays (22). 6) Corresponding one-to-one with the air vent (21), the upper part of the outer periphery of the first cap (26) is evenly provided with multiple first sieve holes (28), the upper part of the outer periphery of the first cap (26) is provided with a connecting plate (23), the lower part of the outer end of the connecting plate (23) is provided with a sieve plate (27), the sieve plate (27) is evenly provided with multiple second sieve holes (24), the connecting plate (23) and the sieve plate (27) are enclosed to form a second cap, and the lower part of the four outer sides of the first cap (26) is provided with a through groove (25).
3. The low-temperature methanol tail gas scrubbing tower according to claim 1, characterized in that: The snap-fit assembly includes a slot formed on the upper surface of the washing tower body (5), and a snap-fit block (29) is installed on the lower surface of the tower cover (10), and the snap-fit block (29) and the slot are snap-fit connected.
4. The low-temperature methanol tail gas scrubbing tower according to claim 1, characterized in that: It also includes a demisting assembly, which includes a demisting plate (16), bolts (17) and a plurality of mounting plates (15) evenly installed above the interior of the washing tower body (5). The mounting plates (15) have threaded holes, and the demisting plate (16) is threadedly fixed to the mounting plate (15) by bolts (17).